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Finding the Fourth Proportional to 128,411.40, 177,320.34 and 80,747.40

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Solution

The fourth proportional to 128,411.40, 177,320.34 and 80,747.40 is: 111,502.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.40 : 177,320.34 = 80,747.40 : x
  2. Step 2: Convert to fraction form
    128,411.40/177,320.34 = 80,747.40/x
  3. Step 3: Cross multiply
    128,411.40x = 177,320.34 × 80,747.40
  4. Step 4: Simplify right side
    128,411.40x = 14,318,156,422.12
  5. Step 5: Solve for x
    x = 14,318,156,422.12/128,411.40
  6. Step 6: Final answer
    x = 111,502.22

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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.