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Finding the Fourth Proportional to 432,019.61, 647,972.52 and 128,407.28

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Solution

The fourth proportional to 432,019.61, 647,972.52 and 128,407.28 is: 192,594.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,019.61 : 647,972.52 = 128,407.28 : x
  2. Step 2: Convert to fraction form
    432,019.61/647,972.52 = 128,407.28/x
  3. Step 3: Cross multiply
    432,019.61x = 647,972.52 × 128,407.28
  4. Step 4: Simplify right side
    432,019.61x = 83,204,390,914.97
  5. Step 5: Solve for x
    x = 83,204,390,914.97/432,019.61
  6. Step 6: Final answer
    x = 192,594.01

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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.