Home / 138,705.13-191,423.20-78,281.06

Finding the Fourth Proportional to 138,705.13, 191,423.20 and 78,281.06

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Solution

The fourth proportional to 138,705.13, 191,423.20 and 78,281.06 is: 108,033.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,705.13 : 191,423.20 = 78,281.06 : x
  2. Step 2: Convert to fraction form
    138,705.13/191,423.20 = 78,281.06/x
  3. Step 3: Cross multiply
    138,705.13x = 191,423.20 × 78,281.06
  4. Step 4: Simplify right side
    138,705.13x = 14,984,811,004.59
  5. Step 5: Solve for x
    x = 14,984,811,004.59/138,705.13
  6. Step 6: Final answer
    x = 108,033.57

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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.