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Finding the Fourth Proportional to 155,063.57, 213,931.73 and 87,956.69

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Solution

The fourth proportional to 155,063.57, 213,931.73 and 87,956.69 is: 121,348.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,063.57 : 213,931.73 = 87,956.69 : x
  2. Step 2: Convert to fraction form
    155,063.57/213,931.73 = 87,956.69/x
  3. Step 3: Cross multiply
    155,063.57x = 213,931.73 × 87,956.69
  4. Step 4: Simplify right side
    155,063.57x = 18,816,726,007.01
  5. Step 5: Solve for x
    x = 18,816,726,007.01/155,063.57
  6. Step 6: Final answer
    x = 121,348.47

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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.