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Finding the Fourth Proportional to 212,766.70, 318,878.70 and 112,974.70

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Solution

The fourth proportional to 212,766.70, 318,878.70 and 112,974.70 is: 169,317.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,766.70 : 318,878.70 = 112,974.70 : x
  2. Step 2: Convert to fraction form
    212,766.70/318,878.70 = 112,974.70/x
  3. Step 3: Cross multiply
    212,766.70x = 318,878.70 × 112,974.70
  4. Step 4: Simplify right side
    212,766.70x = 36,025,225,468.89
  5. Step 5: Solve for x
    x = 36,025,225,468.89/212,766.70
  6. Step 6: Final answer
    x = 169,317.97

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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.