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Finding the Fourth Proportional to 139,044.60, 208,737.27 and 91,699.20

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Solution

The fourth proportional to 139,044.60, 208,737.27 and 91,699.20 is: 137,661.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,044.60 : 208,737.27 = 91,699.20 : x
  2. Step 2: Convert to fraction form
    139,044.60/208,737.27 = 91,699.20/x
  3. Step 3: Cross multiply
    139,044.60x = 208,737.27 × 91,699.20
  4. Step 4: Simplify right side
    139,044.60x = 19,141,040,669.18
  5. Step 5: Solve for x
    x = 19,141,040,669.18/139,044.60
  6. Step 6: Final answer
    x = 137,661.16

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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.