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Finding the Fourth Proportional to 687.64, 1,029.62 and 578.29

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Solution

The fourth proportional to 687.64, 1,029.62 and 578.29 is: 865.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.64 : 1,029.62 = 578.29 : x
  2. Step 2: Convert to fraction form
    687.64/1,029.62 = 578.29/x
  3. Step 3: Cross multiply
    687.64x = 1,029.62 × 578.29
  4. Step 4: Simplify right side
    687.64x = 595,420.80
  5. Step 5: Solve for x
    x = 595,420.80/687.64
  6. Step 6: Final answer
    x = 865.89

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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.