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Finding the Fourth Proportional to 458.76, 688.32 and 215.16

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Solution

The fourth proportional to 458.76, 688.32 and 215.16 is: 322.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.76 : 688.32 = 215.16 : x
  2. Step 2: Convert to fraction form
    458.76/688.32 = 215.16/x
  3. Step 3: Cross multiply
    458.76x = 688.32 × 215.16
  4. Step 4: Simplify right side
    458.76x = 148,098.93
  5. Step 5: Solve for x
    x = 148,098.93/458.76
  6. Step 6: Final answer
    x = 322.82

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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.