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Finding the Fourth Proportional to 678.70, 1,015.65 and 472.30

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Solution

The fourth proportional to 678.70, 1,015.65 and 472.30 is: 706.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.70 : 1,015.65 = 472.30 : x
  2. Step 2: Convert to fraction form
    678.70/1,015.65 = 472.30/x
  3. Step 3: Cross multiply
    678.70x = 1,015.65 × 472.30
  4. Step 4: Simplify right side
    678.70x = 479,691.50
  5. Step 5: Solve for x
    x = 479,691.50/678.70
  6. Step 6: Final answer
    x = 706.78

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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.