Home / 138,881.57-191,633.99-78,438.42

Finding the Fourth Proportional to 138,881.57, 191,633.99 and 78,438.42

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Solution

The fourth proportional to 138,881.57, 191,633.99 and 78,438.42 is: 108,232.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,881.57 : 191,633.99 = 78,438.42 : x
  2. Step 2: Convert to fraction form
    138,881.57/191,633.99 = 78,438.42/x
  3. Step 3: Cross multiply
    138,881.57x = 191,633.99 × 78,438.42
  4. Step 4: Simplify right side
    138,881.57x = 15,031,467,001.70
  5. Step 5: Solve for x
    x = 15,031,467,001.70/138,881.57
  6. Step 6: Final answer
    x = 108,232.27

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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.