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Finding the Fourth Proportional to 77,079, 115,618.50 and 18,711

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Solution

The fourth proportional to 77,079, 115,618.50 and 18,711 is: 28,066.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,079 : 115,618.50 = 18,711 : x
  2. Step 2: Convert to fraction form
    77,079/115,618.50 = 18,711/x
  3. Step 3: Cross multiply
    77,079x = 115,618.50 × 18,711
  4. Step 4: Simplify right side
    77,079x = 2,163,337,753.50
  5. Step 5: Solve for x
    x = 2,163,337,753.50/77,079
  6. Step 6: Final answer
    x = 28,066.50

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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.