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Finding the Fourth Proportional to 128,702.52, 177,602.22 and 74,996.28

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Solution

The fourth proportional to 128,702.52, 177,602.22 and 74,996.28 is: 103,490.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,702.52 : 177,602.22 = 74,996.28 : x
  2. Step 2: Convert to fraction form
    128,702.52/177,602.22 = 74,996.28/x
  3. Step 3: Cross multiply
    128,702.52x = 177,602.22 × 74,996.28
  4. Step 4: Simplify right side
    128,702.52x = 13,319,505,819.74
  5. Step 5: Solve for x
    x = 13,319,505,819.74/128,702.52
  6. Step 6: Final answer
    x = 103,490.64

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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.