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Finding the Fourth Proportional to 128,253.16, 176,988.99 and 71,664.58

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Solution

The fourth proportional to 128,253.16, 176,988.99 and 71,664.58 is: 98,896.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,253.16 : 176,988.99 = 71,664.58 : x
  2. Step 2: Convert to fraction form
    128,253.16/176,988.99 = 71,664.58/x
  3. Step 3: Cross multiply
    128,253.16x = 176,988.99 × 71,664.58
  4. Step 4: Simplify right side
    128,253.16x = 12,683,841,632.97
  5. Step 5: Solve for x
    x = 12,683,841,632.97/128,253.16
  6. Step 6: Final answer
    x = 98,896.91

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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.