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Finding the Fourth Proportional to 7,910.19, 10,915.20 and 5,115.69

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Solution

The fourth proportional to 7,910.19, 10,915.20 and 5,115.69 is: 7,059.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,910.19 : 10,915.20 = 5,115.69 : x
  2. Step 2: Convert to fraction form
    7,910.19/10,915.20 = 5,115.69/x
  3. Step 3: Cross multiply
    7,910.19x = 10,915.20 × 5,115.69
  4. Step 4: Simplify right side
    7,910.19x = 55,838,779.49
  5. Step 5: Solve for x
    x = 55,838,779.49/7,910.19
  6. Step 6: Final answer
    x = 7,059.09

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Half scale
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Double scale
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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.