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Finding the Fourth Proportional to 722.37, 1,083.69 and 430.38

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Solution

The fourth proportional to 722.37, 1,083.69 and 430.38 is: 645.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.37 : 1,083.69 = 430.38 : x
  2. Step 2: Convert to fraction form
    722.37/1,083.69 = 430.38/x
  3. Step 3: Cross multiply
    722.37x = 1,083.69 × 430.38
  4. Step 4: Simplify right side
    722.37x = 466,398.50
  5. Step 5: Solve for x
    x = 466,398.50/722.37
  6. Step 6: Final answer
    x = 645.65

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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.