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Finding the Fourth Proportional to 1,211.52, 1,671.76 and 687.18

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Solution

The fourth proportional to 1,211.52, 1,671.76 and 687.18 is: 948.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.52 : 1,671.76 = 687.18 : x
  2. Step 2: Convert to fraction form
    1,211.52/1,671.76 = 687.18/x
  3. Step 3: Cross multiply
    1,211.52x = 1,671.76 × 687.18
  4. Step 4: Simplify right side
    1,211.52x = 1,148,800.04
  5. Step 5: Solve for x
    x = 1,148,800.04/1,211.52
  6. Step 6: Final answer
    x = 948.23

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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.