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Finding the Fourth Proportional to 1,211.90, 1,672.85 and 714.76

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Solution

The fourth proportional to 1,211.90, 1,672.85 and 714.76 is: 986.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.90 : 1,672.85 = 714.76 : x
  2. Step 2: Convert to fraction form
    1,211.90/1,672.85 = 714.76/x
  3. Step 3: Cross multiply
    1,211.90x = 1,672.85 × 714.76
  4. Step 4: Simplify right side
    1,211.90x = 1,195,683.87
  5. Step 5: Solve for x
    x = 1,195,683.87/1,211.90
  6. Step 6: Final answer
    x = 986.62

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Half scale
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Double scale
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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.