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Finding the Fourth Proportional to 128,445.70, 177,252.53 and 71,081.68

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Solution

The fourth proportional to 128,445.70, 177,252.53 and 71,081.68 is: 98,091.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,445.70 : 177,252.53 = 71,081.68 : x
  2. Step 2: Convert to fraction form
    128,445.70/177,252.53 = 71,081.68/x
  3. Step 3: Cross multiply
    128,445.70x = 177,252.53 × 71,081.68
  4. Step 4: Simplify right side
    128,445.70x = 12,599,406,585.31
  5. Step 5: Solve for x
    x = 12,599,406,585.31/128,445.70
  6. Step 6: Final answer
    x = 98,091.30

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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.