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Finding the Fourth Proportional to 621.59, 931.28 and 519.53

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Solution

The fourth proportional to 621.59, 931.28 and 519.53 is: 778.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.59 : 931.28 = 519.53 : x
  2. Step 2: Convert to fraction form
    621.59/931.28 = 519.53/x
  3. Step 3: Cross multiply
    621.59x = 931.28 × 519.53
  4. Step 4: Simplify right side
    621.59x = 483,820.64
  5. Step 5: Solve for x
    x = 483,820.64/621.59
  6. Step 6: Final answer
    x = 778.37

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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.