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Finding the Fourth Proportional to 928.29, 1,280.19 and 679.53

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Solution

The fourth proportional to 928.29, 1,280.19 and 679.53 is: 937.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.29 : 1,280.19 = 679.53 : x
  2. Step 2: Convert to fraction form
    928.29/1,280.19 = 679.53/x
  3. Step 3: Cross multiply
    928.29x = 1,280.19 × 679.53
  4. Step 4: Simplify right side
    928.29x = 869,927.51
  5. Step 5: Solve for x
    x = 869,927.51/928.29
  6. Step 6: Final answer
    x = 937.13

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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.