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Finding the Fourth Proportional to 128,243.04, 176,972.08 and 71,654.80

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Solution

The fourth proportional to 128,243.04, 176,972.08 and 71,654.80 is: 98,881.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,243.04 : 176,972.08 = 71,654.80 : x
  2. Step 2: Convert to fraction form
    128,243.04/176,972.08 = 71,654.80/x
  3. Step 3: Cross multiply
    128,243.04x = 176,972.08 × 71,654.80
  4. Step 4: Simplify right side
    128,243.04x = 12,680,898,997.98
  5. Step 5: Solve for x
    x = 12,680,898,997.98/128,243.04
  6. Step 6: Final answer
    x = 98,881.77

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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.