Home / 138,707.46-191,416.23-78,290.78

Finding the Fourth Proportional to 138,707.46, 191,416.23 and 78,290.78

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Solution

The fourth proportional to 138,707.46, 191,416.23 and 78,290.78 is: 108,041.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,707.46 : 191,416.23 = 78,290.78 : x
  2. Step 2: Convert to fraction form
    138,707.46/191,416.23 = 78,290.78/x
  3. Step 3: Cross multiply
    138,707.46x = 191,416.23 × 78,290.78
  4. Step 4: Simplify right side
    138,707.46x = 14,986,125,951.36
  5. Step 5: Solve for x
    x = 14,986,125,951.36/138,707.46
  6. Step 6: Final answer
    x = 108,041.24

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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.