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Finding the Fourth Proportional to 789.86, 1,089.71 and 458.23

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Solution

The fourth proportional to 789.86, 1,089.71 and 458.23 is: 632.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.86 : 1,089.71 = 458.23 : x
  2. Step 2: Convert to fraction form
    789.86/1,089.71 = 458.23/x
  3. Step 3: Cross multiply
    789.86x = 1,089.71 × 458.23
  4. Step 4: Simplify right side
    789.86x = 499,332.80
  5. Step 5: Solve for x
    x = 499,332.80/789.86
  6. Step 6: Final answer
    x = 632.18

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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.