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Finding the Fourth Proportional to 5,728.40, 8,587.20 and 5,145.20

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Solution

The fourth proportional to 5,728.40, 8,587.20 and 5,145.20 is: 7,712.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,728.40 : 8,587.20 = 5,145.20 : x
  2. Step 2: Convert to fraction form
    5,728.40/8,587.20 = 5,145.20/x
  3. Step 3: Cross multiply
    5,728.40x = 8,587.20 × 5,145.20
  4. Step 4: Simplify right side
    5,728.40x = 44,182,861.44
  5. Step 5: Solve for x
    x = 44,182,861.44/5,728.40
  6. Step 6: Final answer
    x = 7,712.95

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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.