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Finding the Fourth Proportional to 9,135.20, 13,702.80 and 8,818.40

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Solution

The fourth proportional to 9,135.20, 13,702.80 and 8,818.40 is: 13,227.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,135.20 : 13,702.80 = 8,818.40 : x
  2. Step 2: Convert to fraction form
    9,135.20/13,702.80 = 8,818.40/x
  3. Step 3: Cross multiply
    9,135.20x = 13,702.80 × 8,818.40
  4. Step 4: Simplify right side
    9,135.20x = 120,836,771.52
  5. Step 5: Solve for x
    x = 120,836,771.52/9,135.20
  6. Step 6: Final answer
    x = 13,227.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.