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Finding the Fourth Proportional to 9,612.40, 14,418.60 and 8,640.40

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Solution

The fourth proportional to 9,612.40, 14,418.60 and 8,640.40 is: 12,960.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,612.40 : 14,418.60 = 8,640.40 : x
  2. Step 2: Convert to fraction form
    9,612.40/14,418.60 = 8,640.40/x
  3. Step 3: Cross multiply
    9,612.40x = 14,418.60 × 8,640.40
  4. Step 4: Simplify right side
    9,612.40x = 124,582,471.44
  5. Step 5: Solve for x
    x = 124,582,471.44/9,612.40
  6. Step 6: Final answer
    x = 12,960.60

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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.