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Finding the Fourth Proportional to 696.60, 1,043.28 and 648

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Solution

The fourth proportional to 696.60, 1,043.28 and 648 is: 970.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.60 : 1,043.28 = 648 : x
  2. Step 2: Convert to fraction form
    696.60/1,043.28 = 648/x
  3. Step 3: Cross multiply
    696.60x = 1,043.28 × 648
  4. Step 4: Simplify right side
    696.60x = 676,045.44
  5. Step 5: Solve for x
    x = 676,045.44/696.60
  6. Step 6: Final answer
    x = 970.49

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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.