Home / 138,778.18-191,515.29-75,117.34

Finding the Fourth Proportional to 138,778.18, 191,515.29 and 75,117.34

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Solution

The fourth proportional to 138,778.18, 191,515.29 and 75,117.34 is: 103,662.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,778.18 : 191,515.29 = 75,117.34 : x
  2. Step 2: Convert to fraction form
    138,778.18/191,515.29 = 75,117.34/x
  3. Step 3: Cross multiply
    138,778.18x = 191,515.29 × 75,117.34
  4. Step 4: Simplify right side
    138,778.18x = 14,386,119,154.13
  5. Step 5: Solve for x
    x = 14,386,119,154.13/138,778.18
  6. Step 6: Final answer
    x = 103,662.69

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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.