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Finding the Fourth Proportional to 515.31, 772.15 and 322.53

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Solution

The fourth proportional to 515.31, 772.15 and 322.53 is: 483.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.31 : 772.15 = 322.53 : x
  2. Step 2: Convert to fraction form
    515.31/772.15 = 322.53/x
  3. Step 3: Cross multiply
    515.31x = 772.15 × 322.53
  4. Step 4: Simplify right side
    515.31x = 249,039.93
  5. Step 5: Solve for x
    x = 249,039.93/515.31
  6. Step 6: Final answer
    x = 483.28

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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.