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Finding the Fourth Proportional to 1,122.64, 1,680.72 and 688.48

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Solution

The fourth proportional to 1,122.64, 1,680.72 and 688.48 is: 1,030.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.64 : 1,680.72 = 688.48 : x
  2. Step 2: Convert to fraction form
    1,122.64/1,680.72 = 688.48/x
  3. Step 3: Cross multiply
    1,122.64x = 1,680.72 × 688.48
  4. Step 4: Simplify right side
    1,122.64x = 1,157,142.11
  5. Step 5: Solve for x
    x = 1,157,142.11/1,122.64
  6. Step 6: Final answer
    x = 1,030.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.