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Finding the Fourth Proportional to 5,120.64, 7,680.72 and 1,658.16

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Solution

The fourth proportional to 5,120.64, 7,680.72 and 1,658.16 is: 2,487.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.64 : 7,680.72 = 1,658.16 : x
  2. Step 2: Convert to fraction form
    5,120.64/7,680.72 = 1,658.16/x
  3. Step 3: Cross multiply
    5,120.64x = 7,680.72 × 1,658.16
  4. Step 4: Simplify right side
    5,120.64x = 12,735,862.68
  5. Step 5: Solve for x
    x = 12,735,862.68/5,120.64
  6. Step 6: Final answer
    x = 2,487.16

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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.