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Finding the Fourth Proportional to 128,301.40, 177,051.18 and 71,713.72

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Solution

The fourth proportional to 128,301.40, 177,051.18 and 71,713.72 is: 98,962.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,301.40 : 177,051.18 = 71,713.72 : x
  2. Step 2: Convert to fraction form
    128,301.40/177,051.18 = 71,713.72/x
  3. Step 3: Cross multiply
    128,301.40x = 177,051.18 × 71,713.72
  4. Step 4: Simplify right side
    128,301.40x = 12,696,998,748.19
  5. Step 5: Solve for x
    x = 12,696,998,748.19/128,301.40
  6. Step 6: Final answer
    x = 98,962.28

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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.