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Finding the Fourth Proportional to 722.61, 1,084.98 and 687.87

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Solution

The fourth proportional to 722.61, 1,084.98 and 687.87 is: 1,032.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.61 : 1,084.98 = 687.87 : x
  2. Step 2: Convert to fraction form
    722.61/1,084.98 = 687.87/x
  3. Step 3: Cross multiply
    722.61x = 1,084.98 × 687.87
  4. Step 4: Simplify right side
    722.61x = 746,325.19
  5. Step 5: Solve for x
    x = 746,325.19/722.61
  6. Step 6: Final answer
    x = 1,032.82

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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.