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Finding the Fourth Proportional to 78,680.87, 108,580.84 and 42,870.87

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Solution

The fourth proportional to 78,680.87, 108,580.84 and 42,870.87 is: 59,162.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,680.87 : 108,580.84 = 42,870.87 : x
  2. Step 2: Convert to fraction form
    78,680.87/108,580.84 = 42,870.87/x
  3. Step 3: Cross multiply
    78,680.87x = 108,580.84 × 42,870.87
  4. Step 4: Simplify right side
    78,680.87x = 4,654,954,318.87
  5. Step 5: Solve for x
    x = 4,654,954,318.87/78,680.87
  6. Step 6: Final answer
    x = 59,162.47

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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.