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Finding the Fourth Proportional to 458.28, 687.28 and 304.20

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Solution

The fourth proportional to 458.28, 687.28 and 304.20 is: 456.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.28 : 687.28 = 304.20 : x
  2. Step 2: Convert to fraction form
    458.28/687.28 = 304.20/x
  3. Step 3: Cross multiply
    458.28x = 687.28 × 304.20
  4. Step 4: Simplify right side
    458.28x = 209,070.58
  5. Step 5: Solve for x
    x = 209,070.58/458.28
  6. Step 6: Final answer
    x = 456.21

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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.