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Finding the Fourth Proportional to 934.89, 1,289.42 and 561.80

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Solution

The fourth proportional to 934.89, 1,289.42 and 561.80 is: 774.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.89 : 1,289.42 = 561.80 : x
  2. Step 2: Convert to fraction form
    934.89/1,289.42 = 561.80/x
  3. Step 3: Cross multiply
    934.89x = 1,289.42 × 561.80
  4. Step 4: Simplify right side
    934.89x = 724,398.68
  5. Step 5: Solve for x
    x = 724,398.68/934.89
  6. Step 6: Final answer
    x = 774.85

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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.