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Finding the Fourth Proportional to 1,507.80, 2,262.05 and 686.31

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Solution

The fourth proportional to 1,507.80, 2,262.05 and 686.31 is: 1,029.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,507.80 : 2,262.05 = 686.31 : x
  2. Step 2: Convert to fraction form
    1,507.80/2,262.05 = 686.31/x
  3. Step 3: Cross multiply
    1,507.80x = 2,262.05 × 686.31
  4. Step 4: Simplify right side
    1,507.80x = 1,552,467.54
  5. Step 5: Solve for x
    x = 1,552,467.54/1,507.80
  6. Step 6: Final answer
    x = 1,029.62

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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.