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Finding the Fourth Proportional to 722.61, 1,084.11 and 260.25

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Solution

The fourth proportional to 722.61, 1,084.11 and 260.25 is: 390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.61 : 1,084.11 = 260.25 : x
  2. Step 2: Convert to fraction form
    722.61/1,084.11 = 260.25/x
  3. Step 3: Cross multiply
    722.61x = 1,084.11 × 260.25
  4. Step 4: Simplify right side
    722.61x = 282,134.59
  5. Step 5: Solve for x
    x = 282,134.59/722.61
  6. Step 6: Final answer
    x = 390.44

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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.