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Finding the Fourth Proportional to 2,417.76, 3,626.32 and 686.56

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Solution

The fourth proportional to 2,417.76, 3,626.32 and 686.56 is: 1,029.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,417.76 : 3,626.32 = 686.56 : x
  2. Step 2: Convert to fraction form
    2,417.76/3,626.32 = 686.56/x
  3. Step 3: Cross multiply
    2,417.76x = 3,626.32 × 686.56
  4. Step 4: Simplify right side
    2,417.76x = 2,489,686.26
  5. Step 5: Solve for x
    x = 2,489,686.26/2,417.76
  6. Step 6: Final answer
    x = 1,029.75

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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.