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Finding the Fourth Proportional to 978,128.70, 1,467,193.05 and 660,867.90

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Solution

The fourth proportional to 978,128.70, 1,467,193.05 and 660,867.90 is: 991,301.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,128.70 : 1,467,193.05 = 660,867.90 : x
  2. Step 2: Convert to fraction form
    978,128.70/1,467,193.05 = 660,867.90/x
  3. Step 3: Cross multiply
    978,128.70x = 1,467,193.05 × 660,867.90
  4. Step 4: Simplify right side
    978,128.70x = 969,620,789,848.10
  5. Step 5: Solve for x
    x = 969,620,789,848.10/978,128.70
  6. Step 6: Final answer
    x = 991,301.85

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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.