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Finding the Fourth Proportional to 212,641.38, 318,964.35 and 91,045.53

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Solution

The fourth proportional to 212,641.38, 318,964.35 and 91,045.53 is: 136,569.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,641.38 : 318,964.35 = 91,045.53 : x
  2. Step 2: Convert to fraction form
    212,641.38/318,964.35 = 91,045.53/x
  3. Step 3: Cross multiply
    212,641.38x = 318,964.35 × 91,045.53
  4. Step 4: Simplify right side
    212,641.38x = 29,040,278,296.86
  5. Step 5: Solve for x
    x = 29,040,278,296.86/212,641.38
  6. Step 6: Final answer
    x = 136,569.27

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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.