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Finding the Fourth Proportional to 212,613.80, 318,920.70 and 118,135.40

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Solution

The fourth proportional to 212,613.80, 318,920.70 and 118,135.40 is: 177,203.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,613.80 : 318,920.70 = 118,135.40 : x
  2. Step 2: Convert to fraction form
    212,613.80/318,920.70 = 118,135.40/x
  3. Step 3: Cross multiply
    212,613.80x = 318,920.70 × 118,135.40
  4. Step 4: Simplify right side
    212,613.80x = 37,675,824,462.78
  5. Step 5: Solve for x
    x = 37,675,824,462.78/212,613.80
  6. Step 6: Final answer
    x = 177,203.10

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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.