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Finding the Fourth Proportional to 128,017.80, 176,664.51 and 71,429.13

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Solution

The fourth proportional to 128,017.80, 176,664.51 and 71,429.13 is: 98,572.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,017.80 : 176,664.51 = 71,429.13 : x
  2. Step 2: Convert to fraction form
    128,017.80/176,664.51 = 71,429.13/x
  3. Step 3: Cross multiply
    128,017.80x = 176,664.51 × 71,429.13
  4. Step 4: Simplify right side
    128,017.80x = 12,618,992,251.18
  5. Step 5: Solve for x
    x = 12,618,992,251.18/128,017.80
  6. Step 6: Final answer
    x = 98,572.17

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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.