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Finding the Fourth Proportional to 757.70, 1,136.01 and 431.54

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Solution

The fourth proportional to 757.70, 1,136.01 and 431.54 is: 647.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.70 : 1,136.01 = 431.54 : x
  2. Step 2: Convert to fraction form
    757.70/1,136.01 = 431.54/x
  3. Step 3: Cross multiply
    757.70x = 1,136.01 × 431.54
  4. Step 4: Simplify right side
    757.70x = 490,233.76
  5. Step 5: Solve for x
    x = 490,233.76/757.70
  6. Step 6: Final answer
    x = 647.00

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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.