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Finding the Fourth Proportional to 5,480.64, 8,220 and 1,585.60

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Solution

The fourth proportional to 5,480.64, 8,220 and 1,585.60 is: 2,378.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,480.64 : 8,220 = 1,585.60 : x
  2. Step 2: Convert to fraction form
    5,480.64/8,220 = 1,585.60/x
  3. Step 3: Cross multiply
    5,480.64x = 8,220 × 1,585.60
  4. Step 4: Simplify right side
    5,480.64x = 13,033,632
  5. Step 5: Solve for x
    x = 13,033,632/5,480.64
  6. Step 6: Final answer
    x = 2,378.12

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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.