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Finding the Fourth Proportional to 128,868.92, 177,840.08 and 71,508.47

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Solution

The fourth proportional to 128,868.92, 177,840.08 and 71,508.47 is: 98,682.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,868.92 : 177,840.08 = 71,508.47 : x
  2. Step 2: Convert to fraction form
    128,868.92/177,840.08 = 71,508.47/x
  3. Step 3: Cross multiply
    128,868.92x = 177,840.08 × 71,508.47
  4. Step 4: Simplify right side
    128,868.92x = 12,717,072,248.36
  5. Step 5: Solve for x
    x = 12,717,072,248.36/128,868.92
  6. Step 6: Final answer
    x = 98,682.23

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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.