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Finding the Fourth Proportional to 722.76, 1,084.28 and 289.95

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Solution

The fourth proportional to 722.76, 1,084.28 and 289.95 is: 434.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.76 : 1,084.28 = 289.95 : x
  2. Step 2: Convert to fraction form
    722.76/1,084.28 = 289.95/x
  3. Step 3: Cross multiply
    722.76x = 1,084.28 × 289.95
  4. Step 4: Simplify right side
    722.76x = 314,385.54
  5. Step 5: Solve for x
    x = 314,385.54/722.76
  6. Step 6: Final answer
    x = 434.98

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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.