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Finding the Fourth Proportional to 458.68, 688.38 and 215.08

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Solution

The fourth proportional to 458.68, 688.38 and 215.08 is: 322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.68 : 688.38 = 215.08 : x
  2. Step 2: Convert to fraction form
    458.68/688.38 = 215.08/x
  3. Step 3: Cross multiply
    458.68x = 688.38 × 215.08
  4. Step 4: Simplify right side
    458.68x = 148,056.77
  5. Step 5: Solve for x
    x = 148,056.77/458.68
  6. Step 6: Final answer
    x = 322.79

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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.