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Finding the Fourth Proportional to 928.67, 1,387.55 and 896.38

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Solution

The fourth proportional to 928.67, 1,387.55 and 896.38 is: 1,339.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.67 : 1,387.55 = 896.38 : x
  2. Step 2: Convert to fraction form
    928.67/1,387.55 = 896.38/x
  3. Step 3: Cross multiply
    928.67x = 1,387.55 × 896.38
  4. Step 4: Simplify right side
    928.67x = 1,243,772.07
  5. Step 5: Solve for x
    x = 1,243,772.07/928.67
  6. Step 6: Final answer
    x = 1,339.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.