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Finding the Fourth Proportional to 1,211.81, 1,672.25 and 714.74

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Solution

The fourth proportional to 1,211.81, 1,672.25 and 714.74 is: 986.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.81 : 1,672.25 = 714.74 : x
  2. Step 2: Convert to fraction form
    1,211.81/1,672.25 = 714.74/x
  3. Step 3: Cross multiply
    1,211.81x = 1,672.25 × 714.74
  4. Step 4: Simplify right side
    1,211.81x = 1,195,212.03
  5. Step 5: Solve for x
    x = 1,195,212.03/1,211.81
  6. Step 6: Final answer
    x = 986.31

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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.