Home / 128,979.11-177,988.65-71,615.47

Finding the Fourth Proportional to 128,979.11, 177,988.65 and 71,615.47

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Solution

The fourth proportional to 128,979.11, 177,988.65 and 71,615.47 is: 98,827.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.11 : 177,988.65 = 71,615.47 : x
  2. Step 2: Convert to fraction form
    128,979.11/177,988.65 = 71,615.47/x
  3. Step 3: Cross multiply
    128,979.11x = 177,988.65 × 71,615.47
  4. Step 4: Simplify right side
    128,979.11x = 12,746,740,824.42
  5. Step 5: Solve for x
    x = 12,746,740,824.42/128,979.11
  6. Step 6: Final answer
    x = 98,827.95

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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.