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Finding the Fourth Proportional to 1,247.12, 1,870.68 and 381.68

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Solution

The fourth proportional to 1,247.12, 1,870.68 and 381.68 is: 572.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.12 : 1,870.68 = 381.68 : x
  2. Step 2: Convert to fraction form
    1,247.12/1,870.68 = 381.68/x
  3. Step 3: Cross multiply
    1,247.12x = 1,870.68 × 381.68
  4. Step 4: Simplify right side
    1,247.12x = 714,001.14
  5. Step 5: Solve for x
    x = 714,001.14/1,247.12
  6. Step 6: Final answer
    x = 572.52

Related Problems

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Half scale
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Double scale
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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.