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Finding the Fourth Proportional to 928.71, 1,281.60 and 509.05

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Solution

The fourth proportional to 928.71, 1,281.60 and 509.05 is: 702.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.71 : 1,281.60 = 509.05 : x
  2. Step 2: Convert to fraction form
    928.71/1,281.60 = 509.05/x
  3. Step 3: Cross multiply
    928.71x = 1,281.60 × 509.05
  4. Step 4: Simplify right side
    928.71x = 652,398.48
  5. Step 5: Solve for x
    x = 652,398.48/928.71
  6. Step 6: Final answer
    x = 702.48

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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.