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Finding the Fourth Proportional to 138,441.89, 191,049.87 and 74,779.68

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Solution

The fourth proportional to 138,441.89, 191,049.87 and 74,779.68 is: 103,196.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,441.89 : 191,049.87 = 74,779.68 : x
  2. Step 2: Convert to fraction form
    138,441.89/191,049.87 = 74,779.68/x
  3. Step 3: Cross multiply
    138,441.89x = 191,049.87 × 74,779.68
  4. Step 4: Simplify right side
    138,441.89x = 14,286,648,142.64
  5. Step 5: Solve for x
    x = 14,286,648,142.64/138,441.89
  6. Step 6: Final answer
    x = 103,196.00

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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.