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Finding the Fourth Proportional to 128,389.59, 177,178.86 and 71,801.10

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Solution

The fourth proportional to 128,389.59, 177,178.86 and 71,801.10 is: 99,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,389.59 : 177,178.86 = 71,801.10 : x
  2. Step 2: Convert to fraction form
    128,389.59/177,178.86 = 71,801.10/x
  3. Step 3: Cross multiply
    128,389.59x = 177,178.86 × 71,801.10
  4. Step 4: Simplify right side
    128,389.59x = 12,721,637,044.75
  5. Step 5: Solve for x
    x = 12,721,637,044.75/128,389.59
  6. Step 6: Final answer
    x = 99,086.20

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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.