Home / 128,781.03-177,711.65-71,415.86

Finding the Fourth Proportional to 128,781.03, 177,711.65 and 71,415.86

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Solution

The fourth proportional to 128,781.03, 177,711.65 and 71,415.86 is: 98,550.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,781.03 : 177,711.65 = 71,415.86 : x
  2. Step 2: Convert to fraction form
    128,781.03/177,711.65 = 71,415.86/x
  3. Step 3: Cross multiply
    128,781.03x = 177,711.65 × 71,415.86
  4. Step 4: Simplify right side
    128,781.03x = 12,691,429,071.13
  5. Step 5: Solve for x
    x = 12,691,429,071.13/128,781.03
  6. Step 6: Final answer
    x = 98,550.45

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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.