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Finding the Fourth Proportional to 1,725.78, 2,587.20 and 686.51

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Solution

The fourth proportional to 1,725.78, 2,587.20 and 686.51 is: 1,029.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,725.78 : 2,587.20 = 686.51 : x
  2. Step 2: Convert to fraction form
    1,725.78/2,587.20 = 686.51/x
  3. Step 3: Cross multiply
    1,725.78x = 2,587.20 × 686.51
  4. Step 4: Simplify right side
    1,725.78x = 1,776,145.14
  5. Step 5: Solve for x
    x = 1,776,145.14/1,725.78
  6. Step 6: Final answer
    x = 1,029.18

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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.