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Finding the Fourth Proportional to 1,689.30, 2,532.51 and 648.75

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Solution

The fourth proportional to 1,689.30, 2,532.51 and 648.75 is: 972.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.30 : 2,532.51 = 648.75 : x
  2. Step 2: Convert to fraction form
    1,689.30/2,532.51 = 648.75/x
  3. Step 3: Cross multiply
    1,689.30x = 2,532.51 × 648.75
  4. Step 4: Simplify right side
    1,689.30x = 1,642,965.86
  5. Step 5: Solve for x
    x = 1,642,965.86/1,689.30
  6. Step 6: Final answer
    x = 972.57

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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.