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Finding the Fourth Proportional to 7,640.79, 11,478.72 and 5,394.48

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Solution

The fourth proportional to 7,640.79, 11,478.72 and 5,394.48 is: 8,104.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,640.79 : 11,478.72 = 5,394.48 : x
  2. Step 2: Convert to fraction form
    7,640.79/11,478.72 = 5,394.48/x
  3. Step 3: Cross multiply
    7,640.79x = 11,478.72 × 5,394.48
  4. Step 4: Simplify right side
    7,640.79x = 61,921,725.47
  5. Step 5: Solve for x
    x = 61,921,725.47/7,640.79
  6. Step 6: Final answer
    x = 8,104.10

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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.