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Finding the Fourth Proportional to 128,491.32, 192,387.06 and 99,929.10

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Solution

The fourth proportional to 128,491.32, 192,387.06 and 99,929.10 is: 149,621.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.32 : 192,387.06 = 99,929.10 : x
  2. Step 2: Convert to fraction form
    128,491.32/192,387.06 = 99,929.10/x
  3. Step 3: Cross multiply
    128,491.32x = 192,387.06 × 99,929.10
  4. Step 4: Simplify right side
    128,491.32x = 19,225,065,757.45
  5. Step 5: Solve for x
    x = 19,225,065,757.45/128,491.32
  6. Step 6: Final answer
    x = 149,621.51

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1.5x scale

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.