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Finding the Fourth Proportional to 3,240.96, 4,471.48 and 1,915.12

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Solution

The fourth proportional to 3,240.96, 4,471.48 and 1,915.12 is: 2,642.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,240.96 : 4,471.48 = 1,915.12 : x
  2. Step 2: Convert to fraction form
    3,240.96/4,471.48 = 1,915.12/x
  3. Step 3: Cross multiply
    3,240.96x = 4,471.48 × 1,915.12
  4. Step 4: Simplify right side
    3,240.96x = 8,563,420.78
  5. Step 5: Solve for x
    x = 8,563,420.78/3,240.96
  6. Step 6: Final answer
    x = 2,642.25

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Half 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.