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Finding the Fourth Proportional to 1,689.59, 2,532.15 and 765.58

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Solution

The fourth proportional to 1,689.59, 2,532.15 and 765.58 is: 1,147.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.59 : 2,532.15 = 765.58 : x
  2. Step 2: Convert to fraction form
    1,689.59/2,532.15 = 765.58/x
  3. Step 3: Cross multiply
    1,689.59x = 2,532.15 × 765.58
  4. Step 4: Simplify right side
    1,689.59x = 1,938,557.07
  5. Step 5: Solve for x
    x = 1,938,557.07/1,689.59
  6. Step 6: Final answer
    x = 1,147.36

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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.