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Finding the Fourth Proportional to 1,217.85, 1,680.63 and 706.92

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Solution

The fourth proportional to 1,217.85, 1,680.63 and 706.92 is: 975.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.85 : 1,680.63 = 706.92 : x
  2. Step 2: Convert to fraction form
    1,217.85/1,680.63 = 706.92/x
  3. Step 3: Cross multiply
    1,217.85x = 1,680.63 × 706.92
  4. Step 4: Simplify right side
    1,217.85x = 1,188,070.96
  5. Step 5: Solve for x
    x = 1,188,070.96/1,217.85
  6. Step 6: Final answer
    x = 975.55

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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.