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Finding the Fourth Proportional to 128,908.40, 193,411.20 and 62,407.40

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Solution

The fourth proportional to 128,908.40, 193,411.20 and 62,407.40 is: 93,634.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908.40 : 193,411.20 = 62,407.40 : x
  2. Step 2: Convert to fraction form
    128,908.40/193,411.20 = 62,407.40/x
  3. Step 3: Cross multiply
    128,908.40x = 193,411.20 × 62,407.40
  4. Step 4: Simplify right side
    128,908.40x = 12,070,290,122.88
  5. Step 5: Solve for x
    x = 12,070,290,122.88/128,908.40
  6. Step 6: Final answer
    x = 93,634.63

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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.