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Finding the Fourth Proportional to 928.08, 1,280.79 and 613.53

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Solution

The fourth proportional to 928.08, 1,280.79 and 613.53 is: 846.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.08 : 1,280.79 = 613.53 : x
  2. Step 2: Convert to fraction form
    928.08/1,280.79 = 613.53/x
  3. Step 3: Cross multiply
    928.08x = 1,280.79 × 613.53
  4. Step 4: Simplify right side
    928.08x = 785,803.09
  5. Step 5: Solve for x
    x = 785,803.09/928.08
  6. Step 6: Final answer
    x = 846.70

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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.