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Finding the Fourth Proportional to 139,070.78, 208,635.21 and 45,569.18

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Solution

The fourth proportional to 139,070.78, 208,635.21 and 45,569.18 is: 68,363.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,070.78 : 208,635.21 = 45,569.18 : x
  2. Step 2: Convert to fraction form
    139,070.78/208,635.21 = 45,569.18/x
  3. Step 3: Cross multiply
    139,070.78x = 208,635.21 × 45,569.18
  4. Step 4: Simplify right side
    139,070.78x = 9,507,335,438.83
  5. Step 5: Solve for x
    x = 9,507,335,438.83/139,070.78
  6. Step 6: Final answer
    x = 68,363.29

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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.