Home / 128,279.04-177,021.76-71,690.88

Finding the Fourth Proportional to 128,279.04, 177,021.76 and 71,690.88

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Solution

The fourth proportional to 128,279.04, 177,021.76 and 71,690.88 is: 98,931.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,279.04 : 177,021.76 = 71,690.88 : x
  2. Step 2: Convert to fraction form
    128,279.04/177,021.76 = 71,690.88/x
  3. Step 3: Cross multiply
    128,279.04x = 177,021.76 × 71,690.88
  4. Step 4: Simplify right side
    128,279.04x = 12,690,845,753.55
  5. Step 5: Solve for x
    x = 12,690,845,753.55/128,279.04
  6. Step 6: Final answer
    x = 98,931.56

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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.