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Finding the Fourth Proportional to 928.88, 1,281.52 and 649.56

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Solution

The fourth proportional to 928.88, 1,281.52 and 649.56 is: 896.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.88 : 1,281.52 = 649.56 : x
  2. Step 2: Convert to fraction form
    928.88/1,281.52 = 649.56/x
  3. Step 3: Cross multiply
    928.88x = 1,281.52 × 649.56
  4. Step 4: Simplify right side
    928.88x = 832,424.13
  5. Step 5: Solve for x
    x = 832,424.13/928.88
  6. Step 6: Final answer
    x = 896.16

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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.