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Finding the Fourth Proportional to 1,212.12, 1,672.50 and 714.48

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Solution

The fourth proportional to 1,212.12, 1,672.50 and 714.48 is: 985.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.12 : 1,672.50 = 714.48 : x
  2. Step 2: Convert to fraction form
    1,212.12/1,672.50 = 714.48/x
  3. Step 3: Cross multiply
    1,212.12x = 1,672.50 × 714.48
  4. Step 4: Simplify right side
    1,212.12x = 1,194,967.80
  5. Step 5: Solve for x
    x = 1,194,967.80/1,212.12
  6. Step 6: Final answer
    x = 985.85

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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.