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Finding the Fourth Proportional to 928.05, 1,280.73 and 508.42

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Solution

The fourth proportional to 928.05, 1,280.73 and 508.42 is: 701.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,280.73 = 508.42 : x
  2. Step 2: Convert to fraction form
    928.05/1,280.73 = 508.42/x
  3. Step 3: Cross multiply
    928.05x = 1,280.73 × 508.42
  4. Step 4: Simplify right side
    928.05x = 651,148.75
  5. Step 5: Solve for x
    x = 651,148.75/928.05
  6. Step 6: Final answer
    x = 701.63

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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.