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Finding the Fourth Proportional to 128,252, 176,987.76 and 71,663.38

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Solution

The fourth proportional to 128,252, 176,987.76 and 71,663.38 is: 98,895.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,252 : 176,987.76 = 71,663.38 : x
  2. Step 2: Convert to fraction form
    128,252/176,987.76 = 71,663.38/x
  3. Step 3: Cross multiply
    128,252x = 176,987.76 × 71,663.38
  4. Step 4: Simplify right side
    128,252x = 12,683,541,100.23
  5. Step 5: Solve for x
    x = 12,683,541,100.23/128,252
  6. Step 6: Final answer
    x = 98,895.46

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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.