Home / 138,717.44-191,430.72-78,290.63

Finding the Fourth Proportional to 138,717.44, 191,430.72 and 78,290.63

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Solution

The fourth proportional to 138,717.44, 191,430.72 and 78,290.63 is: 108,041.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,717.44 : 191,430.72 = 78,290.63 : x
  2. Step 2: Convert to fraction form
    138,717.44/191,430.72 = 78,290.63/x
  3. Step 3: Cross multiply
    138,717.44x = 191,430.72 × 78,290.63
  4. Step 4: Simplify right side
    138,717.44x = 14,987,230,713
  5. Step 5: Solve for x
    x = 14,987,230,713/138,717.44
  6. Step 6: Final answer
    x = 108,041.43

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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.