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Finding the Fourth Proportional to 100,621.66, 138,711.62 and 70,312.88

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Solution

The fourth proportional to 100,621.66, 138,711.62 and 70,312.88 is: 96,929.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,621.66 : 138,711.62 = 70,312.88 : x
  2. Step 2: Convert to fraction form
    100,621.66/138,711.62 = 70,312.88/x
  3. Step 3: Cross multiply
    100,621.66x = 138,711.62 × 70,312.88
  4. Step 4: Simplify right side
    100,621.66x = 9,753,213,491.67
  5. Step 5: Solve for x
    x = 9,753,213,491.67/100,621.66
  6. Step 6: Final answer
    x = 96,929.56

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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.