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Finding the Fourth Proportional to 305.53, 458.32 and 86.16

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Solution

The fourth proportional to 305.53, 458.32 and 86.16 is: 129.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.53 : 458.32 = 86.16 : x
  2. Step 2: Convert to fraction form
    305.53/458.32 = 86.16/x
  3. Step 3: Cross multiply
    305.53x = 458.32 × 86.16
  4. Step 4: Simplify right side
    305.53x = 39,487.74
  5. Step 5: Solve for x
    x = 39,487.74/305.53
  6. Step 6: Final answer
    x = 129.24

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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.