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Finding the Fourth Proportional to 6,640.60, 9,960.90 and 6,543.40

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Solution

The fourth proportional to 6,640.60, 9,960.90 and 6,543.40 is: 9,815.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.60 : 9,960.90 = 6,543.40 : x
  2. Step 2: Convert to fraction form
    6,640.60/9,960.90 = 6,543.40/x
  3. Step 3: Cross multiply
    6,640.60x = 9,960.90 × 6,543.40
  4. Step 4: Simplify right side
    6,640.60x = 65,178,153.06
  5. Step 5: Solve for x
    x = 65,178,153.06/6,640.60
  6. Step 6: Final answer
    x = 9,815.10

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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.