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Finding the Fourth Proportional to 789.48, 1,088.98 and 490.82

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Solution

The fourth proportional to 789.48, 1,088.98 and 490.82 is: 677.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.48 : 1,088.98 = 490.82 : x
  2. Step 2: Convert to fraction form
    789.48/1,088.98 = 490.82/x
  3. Step 3: Cross multiply
    789.48x = 1,088.98 × 490.82
  4. Step 4: Simplify right side
    789.48x = 534,493.16
  5. Step 5: Solve for x
    x = 534,493.16/789.48
  6. Step 6: Final answer
    x = 677.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.