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Finding the Fourth Proportional to 127,987.40, 176,657.74 and 74,289.72

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Solution

The fourth proportional to 127,987.40, 176,657.74 and 74,289.72 is: 102,540.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,987.40 : 176,657.74 = 74,289.72 : x
  2. Step 2: Convert to fraction form
    127,987.40/176,657.74 = 74,289.72/x
  3. Step 3: Cross multiply
    127,987.40x = 176,657.74 × 74,289.72
  4. Step 4: Simplify right side
    127,987.40x = 13,123,853,157.14
  5. Step 5: Solve for x
    x = 13,123,853,157.14/127,987.40
  6. Step 6: Final answer
    x = 102,540.20

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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.