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Finding the Fourth Proportional to 1,240.21, 1,860.32 and 418.49

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Solution

The fourth proportional to 1,240.21, 1,860.32 and 418.49 is: 627.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.21 : 1,860.32 = 418.49 : x
  2. Step 2: Convert to fraction form
    1,240.21/1,860.32 = 418.49/x
  3. Step 3: Cross multiply
    1,240.21x = 1,860.32 × 418.49
  4. Step 4: Simplify right side
    1,240.21x = 778,513.92
  5. Step 5: Solve for x
    x = 778,513.92/1,240.21
  6. Step 6: Final answer
    x = 627.73

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,241.21, 1,861.82 and 419.49
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.