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Finding the Fourth Proportional to 515.56, 772.52 and 322.78

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Solution

The fourth proportional to 515.56, 772.52 and 322.78 is: 483.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.56 : 772.52 = 322.78 : x
  2. Step 2: Convert to fraction form
    515.56/772.52 = 322.78/x
  3. Step 3: Cross multiply
    515.56x = 772.52 × 322.78
  4. Step 4: Simplify right side
    515.56x = 249,354.01
  5. Step 5: Solve for x
    x = 249,354.01/515.56
  6. Step 6: Final answer
    x = 483.66

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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.