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Finding the Fourth Proportional to 5,235.30, 7,869.15 and 5,138.10

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Solution

The fourth proportional to 5,235.30, 7,869.15 and 5,138.10 is: 7,723.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,235.30 : 7,869.15 = 5,138.10 : x
  2. Step 2: Convert to fraction form
    5,235.30/7,869.15 = 5,138.10/x
  3. Step 3: Cross multiply
    5,235.30x = 7,869.15 × 5,138.10
  4. Step 4: Simplify right side
    5,235.30x = 40,432,479.62
  5. Step 5: Solve for x
    x = 40,432,479.62/5,235.30
  6. Step 6: Final answer
    x = 7,723.05

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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.