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Finding the Fourth Proportional to 155,930.71, 215,184.08 and 87,947.47

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Solution

The fourth proportional to 155,930.71, 215,184.08 and 87,947.47 is: 121,367.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,930.71 : 215,184.08 = 87,947.47 : x
  2. Step 2: Convert to fraction form
    155,930.71/215,184.08 = 87,947.47/x
  3. Step 3: Cross multiply
    155,930.71x = 215,184.08 × 87,947.47
  4. Step 4: Simplify right side
    155,930.71x = 18,924,896,063.72
  5. Step 5: Solve for x
    x = 18,924,896,063.72/155,930.71
  6. Step 6: Final answer
    x = 121,367.35

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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.