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Finding the Fourth Proportional to 138,916.99, 208,387.76 and 39,078.01

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Solution

The fourth proportional to 138,916.99, 208,387.76 and 39,078.01 is: 58,620.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,916.99 : 208,387.76 = 39,078.01 : x
  2. Step 2: Convert to fraction form
    138,916.99/208,387.76 = 39,078.01/x
  3. Step 3: Cross multiply
    138,916.99x = 208,387.76 × 39,078.01
  4. Step 4: Simplify right side
    138,916.99x = 8,143,378,969.16
  5. Step 5: Solve for x
    x = 8,143,378,969.16/138,916.99
  6. Step 6: Final answer
    x = 58,620.47

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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.