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Finding the Fourth Proportional to 647,125.20, 970,687.80 and 423,176.40

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Solution

The fourth proportional to 647,125.20, 970,687.80 and 423,176.40 is: 634,764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,125.20 : 970,687.80 = 423,176.40 : x
  2. Step 2: Convert to fraction form
    647,125.20/970,687.80 = 423,176.40/x
  3. Step 3: Cross multiply
    647,125.20x = 970,687.80 × 423,176.40
  4. Step 4: Simplify right side
    647,125.20x = 410,772,168,727.92
  5. Step 5: Solve for x
    x = 410,772,168,727.92/647,125.20
  6. Step 6: Final answer
    x = 634,764.60

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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.