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Finding the Fourth Proportional to 128,577.66, 177,433.11 and 71,218.86

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Solution

The fourth proportional to 128,577.66, 177,433.11 and 71,218.86 is: 98,279.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,577.66 : 177,433.11 = 71,218.86 : x
  2. Step 2: Convert to fraction form
    128,577.66/177,433.11 = 71,218.86/x
  3. Step 3: Cross multiply
    128,577.66x = 177,433.11 × 71,218.86
  4. Step 4: Simplify right side
    128,577.66x = 12,636,583,820.45
  5. Step 5: Solve for x
    x = 12,636,583,820.45/128,577.66
  6. Step 6: Final answer
    x = 98,279.78

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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.