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Finding the Fourth Proportional to 128,818.15, 177,790.32 and 71,475.92

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Solution

The fourth proportional to 128,818.15, 177,790.32 and 71,475.92 is: 98,648.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,818.15 : 177,790.32 = 71,475.92 : x
  2. Step 2: Convert to fraction form
    128,818.15/177,790.32 = 71,475.92/x
  3. Step 3: Cross multiply
    128,818.15x = 177,790.32 × 71,475.92
  4. Step 4: Simplify right side
    128,818.15x = 12,707,726,689.09
  5. Step 5: Solve for x
    x = 12,707,726,689.09/128,818.15
  6. Step 6: Final answer
    x = 98,648.57

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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.