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Finding the Fourth Proportional to 128,554.56, 177,407.28 and 77,569.92

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Solution

The fourth proportional to 128,554.56, 177,407.28 and 77,569.92 is: 107,047.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,554.56 : 177,407.28 = 77,569.92 : x
  2. Step 2: Convert to fraction form
    128,554.56/177,407.28 = 77,569.92/x
  3. Step 3: Cross multiply
    128,554.56x = 177,407.28 × 77,569.92
  4. Step 4: Simplify right side
    128,554.56x = 13,761,468,517.02
  5. Step 5: Solve for x
    x = 13,761,468,517.02/128,554.56
  6. Step 6: Final answer
    x = 107,047.69

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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.