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Finding the Fourth Proportional to 1,680.13, 2,520.55 and 654.13

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Solution

The fourth proportional to 1,680.13, 2,520.55 and 654.13 is: 981.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.13 : 2,520.55 = 654.13 : x
  2. Step 2: Convert to fraction form
    1,680.13/2,520.55 = 654.13/x
  3. Step 3: Cross multiply
    1,680.13x = 2,520.55 × 654.13
  4. Step 4: Simplify right side
    1,680.13x = 1,648,767.37
  5. Step 5: Solve for x
    x = 1,648,767.37/1,680.13
  6. Step 6: Final answer
    x = 981.33

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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.