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Finding the Fourth Proportional to 456.78, 630.20 and 260.15

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Solution

The fourth proportional to 456.78, 630.20 and 260.15 is: 358.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.78 : 630.20 = 260.15 : x
  2. Step 2: Convert to fraction form
    456.78/630.20 = 260.15/x
  3. Step 3: Cross multiply
    456.78x = 630.20 × 260.15
  4. Step 4: Simplify right side
    456.78x = 163,948.76
  5. Step 5: Solve for x
    x = 163,948.76/456.78
  6. Step 6: Final answer
    x = 358.92

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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.