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Finding the Fourth Proportional to 483,709.40, 725,564.10 and 128,759.30

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Solution

The fourth proportional to 483,709.40, 725,564.10 and 128,759.30 is: 193,138.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    483,709.40 : 725,564.10 = 128,759.30 : x
  2. Step 2: Convert to fraction form
    483,709.40/725,564.10 = 128,759.30/x
  3. Step 3: Cross multiply
    483,709.40x = 725,564.10 × 128,759.30
  4. Step 4: Simplify right side
    483,709.40x = 93,423,125,621.13
  5. Step 5: Solve for x
    x = 93,423,125,621.13/483,709.40
  6. Step 6: Final answer
    x = 193,138.95

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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.