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Finding the Fourth Proportional to 128,070.56, 176,731.68 and 71,480.64

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Solution

The fourth proportional to 128,070.56, 176,731.68 and 71,480.64 is: 98,640.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,070.56 : 176,731.68 = 71,480.64 : x
  2. Step 2: Convert to fraction form
    128,070.56/176,731.68 = 71,480.64/x
  3. Step 3: Cross multiply
    128,070.56x = 176,731.68 × 71,480.64
  4. Step 4: Simplify right side
    128,070.56x = 12,632,893,594.68
  5. Step 5: Solve for x
    x = 12,632,893,594.68/128,070.56
  6. Step 6: Final answer
    x = 98,640.11

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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.