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Finding the Fourth Proportional to 8,391.60, 12,570.24 and 3,995.76

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Solution

The fourth proportional to 8,391.60, 12,570.24 and 3,995.76 is: 5,985.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.60 : 12,570.24 = 3,995.76 : x
  2. Step 2: Convert to fraction form
    8,391.60/12,570.24 = 3,995.76/x
  3. Step 3: Cross multiply
    8,391.60x = 12,570.24 × 3,995.76
  4. Step 4: Simplify right side
    8,391.60x = 50,227,662.18
  5. Step 5: Solve for x
    x = 50,227,662.18/8,391.60
  6. Step 6: Final answer
    x = 5,985.47

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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.