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Finding the Fourth Proportional to 1,677.20, 2,512.20 and 1,389.20

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Solution

The fourth proportional to 1,677.20, 2,512.20 and 1,389.20 is: 2,080.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,677.20 : 2,512.20 = 1,389.20 : x
  2. Step 2: Convert to fraction form
    1,677.20/2,512.20 = 1,389.20/x
  3. Step 3: Cross multiply
    1,677.20x = 2,512.20 × 1,389.20
  4. Step 4: Simplify right side
    1,677.20x = 3,489,948.24
  5. Step 5: Solve for x
    x = 3,489,948.24/1,677.20
  6. Step 6: Final answer
    x = 2,080.82

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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.