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Finding the Fourth Proportional to 1,211.34, 1,672.05 and 714.12

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Solution

The fourth proportional to 1,211.34, 1,672.05 and 714.12 is: 985.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.34 : 1,672.05 = 714.12 : x
  2. Step 2: Convert to fraction form
    1,211.34/1,672.05 = 714.12/x
  3. Step 3: Cross multiply
    1,211.34x = 1,672.05 × 714.12
  4. Step 4: Simplify right side
    1,211.34x = 1,194,044.35
  5. Step 5: Solve for x
    x = 1,194,044.35/1,211.34
  6. Step 6: Final answer
    x = 985.72

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1.5x scale

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.