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Finding the Fourth Proportional to 1,217.63, 1,680.26 and 686.52

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Solution

The fourth proportional to 1,217.63, 1,680.26 and 686.52 is: 947.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.63 : 1,680.26 = 686.52 : x
  2. Step 2: Convert to fraction form
    1,217.63/1,680.26 = 686.52/x
  3. Step 3: Cross multiply
    1,217.63x = 1,680.26 × 686.52
  4. Step 4: Simplify right side
    1,217.63x = 1,153,528.66
  5. Step 5: Solve for x
    x = 1,153,528.66/1,217.63
  6. Step 6: Final answer
    x = 947.36

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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.