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Finding the Fourth Proportional to 101,298.36, 139,790.92 and 55,979.40

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Solution

The fourth proportional to 101,298.36, 139,790.92 and 55,979.40 is: 77,251.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,298.36 : 139,790.92 = 55,979.40 : x
  2. Step 2: Convert to fraction form
    101,298.36/139,790.92 = 55,979.40/x
  3. Step 3: Cross multiply
    101,298.36x = 139,790.92 × 55,979.40
  4. Step 4: Simplify right side
    101,298.36x = 7,825,411,827.05
  5. Step 5: Solve for x
    x = 7,825,411,827.05/101,298.36
  6. Step 6: Final answer
    x = 77,251.12

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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.