Home / 138,868.65-191,638.85-78,439.41

Finding the Fourth Proportional to 138,868.65, 191,638.85 and 78,439.41

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Solution

The fourth proportional to 138,868.65, 191,638.85 and 78,439.41 is: 108,246.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,868.65 : 191,638.85 = 78,439.41 : x
  2. Step 2: Convert to fraction form
    138,868.65/191,638.85 = 78,439.41/x
  3. Step 3: Cross multiply
    138,868.65x = 191,638.85 × 78,439.41
  4. Step 4: Simplify right side
    138,868.65x = 15,032,037,934.88
  5. Step 5: Solve for x
    x = 15,032,037,934.88/138,868.65
  6. Step 6: Final answer
    x = 108,246.45

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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.