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Finding the Fourth Proportional to 9,612.80, 13,260.80 and 8,854.40

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Solution

The fourth proportional to 9,612.80, 13,260.80 and 8,854.40 is: 12,214.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,612.80 : 13,260.80 = 8,854.40 : x
  2. Step 2: Convert to fraction form
    9,612.80/13,260.80 = 8,854.40/x
  3. Step 3: Cross multiply
    9,612.80x = 13,260.80 × 8,854.40
  4. Step 4: Simplify right side
    9,612.80x = 117,416,427.52
  5. Step 5: Solve for x
    x = 117,416,427.52/9,612.80
  6. Step 6: Final answer
    x = 12,214.59

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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.