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Finding the Fourth Proportional to 128,377.16, 177,165.30 and 71,788.40

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Solution

The fourth proportional to 128,377.16, 177,165.30 and 71,788.40 is: 99,070.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,377.16 : 177,165.30 = 71,788.40 : x
  2. Step 2: Convert to fraction form
    128,377.16/177,165.30 = 71,788.40/x
  3. Step 3: Cross multiply
    128,377.16x = 177,165.30 × 71,788.40
  4. Step 4: Simplify right side
    128,377.16x = 12,718,413,422.52
  5. Step 5: Solve for x
    x = 12,718,413,422.52/128,377.16
  6. Step 6: Final answer
    x = 99,070.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.