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Finding the Fourth Proportional to 1,211.46, 1,671.87 and 714.08

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Solution

The fourth proportional to 1,211.46, 1,671.87 and 714.08 is: 985.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.46 : 1,671.87 = 714.08 : x
  2. Step 2: Convert to fraction form
    1,211.46/1,671.87 = 714.08/x
  3. Step 3: Cross multiply
    1,211.46x = 1,671.87 × 714.08
  4. Step 4: Simplify right side
    1,211.46x = 1,193,848.93
  5. Step 5: Solve for x
    x = 1,193,848.93/1,211.46
  6. Step 6: Final answer
    x = 985.46

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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.