Home / 138,738.16-191,459.30-78,311.36

Finding the Fourth Proportional to 138,738.16, 191,459.30 and 78,311.36

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Solution

The fourth proportional to 138,738.16, 191,459.30 and 78,311.36 is: 108,070.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,738.16 : 191,459.30 = 78,311.36 : x
  2. Step 2: Convert to fraction form
    138,738.16/191,459.30 = 78,311.36/x
  3. Step 3: Cross multiply
    138,738.16x = 191,459.30 × 78,311.36
  4. Step 4: Simplify right side
    138,738.16x = 14,993,438,167.65
  5. Step 5: Solve for x
    x = 14,993,438,167.65/138,738.16
  6. Step 6: Final answer
    x = 108,070.04

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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.