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Finding the Fourth Proportional to 729.45, 1,005.67 and 561.59

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Solution

The fourth proportional to 729.45, 1,005.67 and 561.59 is: 774.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.45 : 1,005.67 = 561.59 : x
  2. Step 2: Convert to fraction form
    729.45/1,005.67 = 561.59/x
  3. Step 3: Cross multiply
    729.45x = 1,005.67 × 561.59
  4. Step 4: Simplify right side
    729.45x = 564,770.59
  5. Step 5: Solve for x
    x = 564,770.59/729.45
  6. Step 6: Final answer
    x = 774.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.