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Finding the Fourth Proportional to 76,886.20, 115,329.30 and 70,981.30

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Solution

The fourth proportional to 76,886.20, 115,329.30 and 70,981.30 is: 106,471.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,886.20 : 115,329.30 = 70,981.30 : x
  2. Step 2: Convert to fraction form
    76,886.20/115,329.30 = 70,981.30/x
  3. Step 3: Cross multiply
    76,886.20x = 115,329.30 × 70,981.30
  4. Step 4: Simplify right side
    76,886.20x = 8,186,223,642.09
  5. Step 5: Solve for x
    x = 8,186,223,642.09/76,886.20
  6. Step 6: Final answer
    x = 106,471.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.