Home / 138,691.20-191,399.28-81,322.54

Finding the Fourth Proportional to 138,691.20, 191,399.28 and 81,322.54

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Solution

The fourth proportional to 138,691.20, 191,399.28 and 81,322.54 is: 112,228.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,691.20 : 191,399.28 = 81,322.54 : x
  2. Step 2: Convert to fraction form
    138,691.20/191,399.28 = 81,322.54/x
  3. Step 3: Cross multiply
    138,691.20x = 191,399.28 × 81,322.54
  4. Step 4: Simplify right side
    138,691.20x = 15,565,075,603.77
  5. Step 5: Solve for x
    x = 15,565,075,603.77/138,691.20
  6. Step 6: Final answer
    x = 112,228.29

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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.