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Finding the Fourth Proportional to 688.61, 1,025.37 and 671.19

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Solution

The fourth proportional to 688.61, 1,025.37 and 671.19 is: 999.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.61 : 1,025.37 = 671.19 : x
  2. Step 2: Convert to fraction form
    688.61/1,025.37 = 671.19/x
  3. Step 3: Cross multiply
    688.61x = 1,025.37 × 671.19
  4. Step 4: Simplify right side
    688.61x = 688,218.09
  5. Step 5: Solve for x
    x = 688,218.09/688.61
  6. Step 6: Final answer
    x = 999.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.