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Finding the Fourth Proportional to 515.55, 711.39 and 291.48

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Solution

The fourth proportional to 515.55, 711.39 and 291.48 is: 402.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.55 : 711.39 = 291.48 : x
  2. Step 2: Convert to fraction form
    515.55/711.39 = 291.48/x
  3. Step 3: Cross multiply
    515.55x = 711.39 × 291.48
  4. Step 4: Simplify right side
    515.55x = 207,355.96
  5. Step 5: Solve for x
    x = 207,355.96/515.55
  6. Step 6: Final answer
    x = 402.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.