Home / 138,569.91-191,223.79-78,139.45

Finding the Fourth Proportional to 138,569.91, 191,223.79 and 78,139.45

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Solution

The fourth proportional to 138,569.91, 191,223.79 and 78,139.45 is: 107,830.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,569.91 : 191,223.79 = 78,139.45 : x
  2. Step 2: Convert to fraction form
    138,569.91/191,223.79 = 78,139.45/x
  3. Step 3: Cross multiply
    138,569.91x = 191,223.79 × 78,139.45
  4. Step 4: Simplify right side
    138,569.91x = 14,942,121,777.52
  5. Step 5: Solve for x
    x = 14,942,121,777.52/138,569.91
  6. Step 6: Final answer
    x = 107,830.93

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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.