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Finding the Fourth Proportional to 1,689.32, 2,534.21 and 578.94

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Solution

The fourth proportional to 1,689.32, 2,534.21 and 578.94 is: 868.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.32 : 2,534.21 = 578.94 : x
  2. Step 2: Convert to fraction form
    1,689.32/2,534.21 = 578.94/x
  3. Step 3: Cross multiply
    1,689.32x = 2,534.21 × 578.94
  4. Step 4: Simplify right side
    1,689.32x = 1,467,152.64
  5. Step 5: Solve for x
    x = 1,467,152.64/1,689.32
  6. Step 6: Final answer
    x = 868.49

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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.