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Finding the Fourth Proportional to 5,307.40, 7,961.10 and 4,205.80

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Solution

The fourth proportional to 5,307.40, 7,961.10 and 4,205.80 is: 6,308.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,307.40 : 7,961.10 = 4,205.80 : x
  2. Step 2: Convert to fraction form
    5,307.40/7,961.10 = 4,205.80/x
  3. Step 3: Cross multiply
    5,307.40x = 7,961.10 × 4,205.80
  4. Step 4: Simplify right side
    5,307.40x = 33,482,794.38
  5. Step 5: Solve for x
    x = 33,482,794.38/5,307.40
  6. Step 6: Final answer
    x = 6,308.70

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Double scale
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Similar ratio
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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.