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Finding the Fourth Proportional to 1,680.40, 2,515.20 and 1,680.40

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Solution

The fourth proportional to 1,680.40, 2,515.20 and 1,680.40 is: 2,515.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.40 : 2,515.20 = 1,680.40 : x
  2. Step 2: Convert to fraction form
    1,680.40/2,515.20 = 1,680.40/x
  3. Step 3: Cross multiply
    1,680.40x = 2,515.20 × 1,680.40
  4. Step 4: Simplify right side
    1,680.40x = 4,226,542.08
  5. Step 5: Solve for x
    x = 4,226,542.08/1,680.40
  6. Step 6: Final answer
    x = 2,515.20

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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.