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Finding the Fourth Proportional to 139,396.71, 209,020.95 and 55,153.47

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Solution

The fourth proportional to 139,396.71, 209,020.95 and 55,153.47 is: 82,700.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,396.71 : 209,020.95 = 55,153.47 : x
  2. Step 2: Convert to fraction form
    139,396.71/209,020.95 = 55,153.47/x
  3. Step 3: Cross multiply
    139,396.71x = 209,020.95 × 55,153.47
  4. Step 4: Simplify right side
    139,396.71x = 11,528,230,695.20
  5. Step 5: Solve for x
    x = 11,528,230,695.20/139,396.71
  6. Step 6: Final answer
    x = 82,700.88

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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.