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Finding the Fourth Proportional to 5,080, 7,620 and 1,617.52

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Solution

The fourth proportional to 5,080, 7,620 and 1,617.52 is: 2,426.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,080 : 7,620 = 1,617.52 : x
  2. Step 2: Convert to fraction form
    5,080/7,620 = 1,617.52/x
  3. Step 3: Cross multiply
    5,080x = 7,620 × 1,617.52
  4. Step 4: Simplify right side
    5,080x = 12,325,502.40
  5. Step 5: Solve for x
    x = 12,325,502.40/5,080
  6. Step 6: Final answer
    x = 2,426.28

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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.