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Finding the Fourth Proportional to 722.78, 1,084.30 and 235.70

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Solution

The fourth proportional to 722.78, 1,084.30 and 235.70 is: 353.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.78 : 1,084.30 = 235.70 : x
  2. Step 2: Convert to fraction form
    722.78/1,084.30 = 235.70/x
  3. Step 3: Cross multiply
    722.78x = 1,084.30 × 235.70
  4. Step 4: Simplify right side
    722.78x = 255,569.51
  5. Step 5: Solve for x
    x = 255,569.51/722.78
  6. Step 6: Final answer
    x = 353.59

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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.