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Finding the Fourth Proportional to 672,470.40, 1,009,256.40 and 667,221.60

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Solution

The fourth proportional to 672,470.40, 1,009,256.40 and 667,221.60 is: 1,001,378.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,470.40 : 1,009,256.40 = 667,221.60 : x
  2. Step 2: Convert to fraction form
    672,470.40/1,009,256.40 = 667,221.60/x
  3. Step 3: Cross multiply
    672,470.40x = 1,009,256.40 × 667,221.60
  4. Step 4: Simplify right side
    672,470.40x = 673,397,670,018.24
  5. Step 5: Solve for x
    x = 673,397,670,018.24/672,470.40
  6. Step 6: Final answer
    x = 1,001,378.90

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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.