Home / 138,675.34-191,311.19-81,285.57

Finding the Fourth Proportional to 138,675.34, 191,311.19 and 81,285.57

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Solution

The fourth proportional to 138,675.34, 191,311.19 and 81,285.57 is: 112,138.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,675.34 : 191,311.19 = 81,285.57 : x
  2. Step 2: Convert to fraction form
    138,675.34/191,311.19 = 81,285.57/x
  3. Step 3: Cross multiply
    138,675.34x = 191,311.19 × 81,285.57
  4. Step 4: Simplify right side
    138,675.34x = 15,550,839,126.53
  5. Step 5: Solve for x
    x = 15,550,839,126.53/138,675.34
  6. Step 6: Final answer
    x = 112,138.46

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1.5x scale

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.