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Finding the Fourth Proportional to 1,236.90, 1,855.25 and 621.03

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Solution

The fourth proportional to 1,236.90, 1,855.25 and 621.03 is: 931.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.90 : 1,855.25 = 621.03 : x
  2. Step 2: Convert to fraction form
    1,236.90/1,855.25 = 621.03/x
  3. Step 3: Cross multiply
    1,236.90x = 1,855.25 × 621.03
  4. Step 4: Simplify right side
    1,236.90x = 1,152,165.91
  5. Step 5: Solve for x
    x = 1,152,165.91/1,236.90
  6. Step 6: Final answer
    x = 931.49

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Double scale
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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.