Home / 138,501.85-191,121.07-78,087.34

Finding the Fourth Proportional to 138,501.85, 191,121.07 and 78,087.34

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Solution

The fourth proportional to 138,501.85, 191,121.07 and 78,087.34 is: 107,754.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,501.85 : 191,121.07 = 78,087.34 : x
  2. Step 2: Convert to fraction form
    138,501.85/191,121.07 = 78,087.34/x
  3. Step 3: Cross multiply
    138,501.85x = 191,121.07 × 78,087.34
  4. Step 4: Simplify right side
    138,501.85x = 14,924,136,164.35
  5. Step 5: Solve for x
    x = 14,924,136,164.35/138,501.85
  6. Step 6: Final answer
    x = 107,754.06

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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.