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Finding the Fourth Proportional to 128,891.52, 177,869.52 and 75,172.32

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Solution

The fourth proportional to 128,891.52, 177,869.52 and 75,172.32 is: 103,737.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,891.52 : 177,869.52 = 75,172.32 : x
  2. Step 2: Convert to fraction form
    128,891.52/177,869.52 = 75,172.32/x
  3. Step 3: Cross multiply
    128,891.52x = 177,869.52 × 75,172.32
  4. Step 4: Simplify right side
    128,891.52x = 13,370,864,475.69
  5. Step 5: Solve for x
    x = 13,370,864,475.69/128,891.52
  6. Step 6: Final answer
    x = 103,737.35

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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.