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Finding the Fourth Proportional to 128,340.57, 176,924.73 and 87,990.42

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Solution

The fourth proportional to 128,340.57, 176,924.73 and 87,990.42 is: 121,299.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,340.57 : 176,924.73 = 87,990.42 : x
  2. Step 2: Convert to fraction form
    128,340.57/176,924.73 = 87,990.42/x
  3. Step 3: Cross multiply
    128,340.57x = 176,924.73 × 87,990.42
  4. Step 4: Simplify right side
    128,340.57x = 15,567,681,301.09
  5. Step 5: Solve for x
    x = 15,567,681,301.09/128,340.57
  6. Step 6: Final answer
    x = 121,299.77

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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.