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Finding the Fourth Proportional to 772.47, 1,157.81 and 426.02

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Solution

The fourth proportional to 772.47, 1,157.81 and 426.02 is: 638.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.47 : 1,157.81 = 426.02 : x
  2. Step 2: Convert to fraction form
    772.47/1,157.81 = 426.02/x
  3. Step 3: Cross multiply
    772.47x = 1,157.81 × 426.02
  4. Step 4: Simplify right side
    772.47x = 493,242.30
  5. Step 5: Solve for x
    x = 493,242.30/772.47
  6. Step 6: Final answer
    x = 638.53

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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.