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Finding the Fourth Proportional to 128,398.55, 176,940.20 and 92,520.81

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Solution

The fourth proportional to 128,398.55, 176,940.20 and 92,520.81 is: 127,498.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,398.55 : 176,940.20 = 92,520.81 : x
  2. Step 2: Convert to fraction form
    128,398.55/176,940.20 = 92,520.81/x
  3. Step 3: Cross multiply
    128,398.55x = 176,940.20 × 92,520.81
  4. Step 4: Simplify right side
    128,398.55x = 16,370,650,162.96
  5. Step 5: Solve for x
    x = 16,370,650,162.96/128,398.55
  6. Step 6: Final answer
    x = 127,498.72

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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.