Home / 138,505.08-191,131.32-78,088.20

Finding the Fourth Proportional to 138,505.08, 191,131.32 and 78,088.20

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Solution

The fourth proportional to 138,505.08, 191,131.32 and 78,088.20 is: 107,758.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,505.08 : 191,131.32 = 78,088.20 : x
  2. Step 2: Convert to fraction form
    138,505.08/191,131.32 = 78,088.20/x
  3. Step 3: Cross multiply
    138,505.08x = 191,131.32 × 78,088.20
  4. Step 4: Simplify right side
    138,505.08x = 14,925,100,742.42
  5. Step 5: Solve for x
    x = 14,925,100,742.42/138,505.08
  6. Step 6: Final answer
    x = 107,758.51

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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.