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Finding the Fourth Proportional to 928.55, 1,281.40 and 508.90

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Solution

The fourth proportional to 928.55, 1,281.40 and 508.90 is: 702.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.55 : 1,281.40 = 508.90 : x
  2. Step 2: Convert to fraction form
    928.55/1,281.40 = 508.90/x
  3. Step 3: Cross multiply
    928.55x = 1,281.40 × 508.90
  4. Step 4: Simplify right side
    928.55x = 652,104.46
  5. Step 5: Solve for x
    x = 652,104.46/928.55
  6. Step 6: Final answer
    x = 702.28

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1.5x scale

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.