Home / 138,981.12-191,782.40-78,557.12

Finding the Fourth Proportional to 138,981.12, 191,782.40 and 78,557.12

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Solution

The fourth proportional to 138,981.12, 191,782.40 and 78,557.12 is: 108,402.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,981.12 : 191,782.40 = 78,557.12 : x
  2. Step 2: Convert to fraction form
    138,981.12/191,782.40 = 78,557.12/x
  3. Step 3: Cross multiply
    138,981.12x = 191,782.40 × 78,557.12
  4. Step 4: Simplify right side
    138,981.12x = 15,065,873,010.69
  5. Step 5: Solve for x
    x = 15,065,873,010.69/138,981.12
  6. Step 6: Final answer
    x = 108,402.30

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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.