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Finding the Fourth Proportional to 128,920.40, 193,429.20 and 62,419.40

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Solution

The fourth proportional to 128,920.40, 193,429.20 and 62,419.40 is: 93,652.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,920.40 : 193,429.20 = 62,419.40 : x
  2. Step 2: Convert to fraction form
    128,920.40/193,429.20 = 62,419.40/x
  3. Step 3: Cross multiply
    128,920.40x = 193,429.20 × 62,419.40
  4. Step 4: Simplify right side
    128,920.40x = 12,073,734,606.48
  5. Step 5: Solve for x
    x = 12,073,734,606.48/128,920.40
  6. Step 6: Final answer
    x = 93,652.63

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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.