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Finding the Fourth Proportional to 60,742.40, 91,286.40 and 53,139.20

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Solution

The fourth proportional to 60,742.40, 91,286.40 and 53,139.20 is: 79,859.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,742.40 : 91,286.40 = 53,139.20 : x
  2. Step 2: Convert to fraction form
    60,742.40/91,286.40 = 53,139.20/x
  3. Step 3: Cross multiply
    60,742.40x = 91,286.40 × 53,139.20
  4. Step 4: Simplify right side
    60,742.40x = 4,850,886,266.88
  5. Step 5: Solve for x
    x = 4,850,886,266.88/60,742.40
  6. Step 6: Final answer
    x = 79,859.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.