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Finding the Fourth Proportional to 138,505.80, 191,154.84 and 78,088.08

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Solution

The fourth proportional to 138,505.80, 191,154.84 and 78,088.08 is: 107,771.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,505.80 : 191,154.84 = 78,088.08 : x
  2. Step 2: Convert to fraction form
    138,505.80/191,154.84 = 78,088.08/x
  3. Step 3: Cross multiply
    138,505.80x = 191,154.84 × 78,088.08
  4. Step 4: Simplify right side
    138,505.80x = 14,926,914,438.31
  5. Step 5: Solve for x
    x = 14,926,914,438.31/138,505.80
  6. Step 6: Final answer
    x = 107,771.04

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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.