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Finding the Fourth Proportional to 729.41, 1,005.21 and 589.28

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Solution

The fourth proportional to 729.41, 1,005.21 and 589.28 is: 812.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.41 : 1,005.21 = 589.28 : x
  2. Step 2: Convert to fraction form
    729.41/1,005.21 = 589.28/x
  3. Step 3: Cross multiply
    729.41x = 1,005.21 × 589.28
  4. Step 4: Simplify right side
    729.41x = 592,345.12
  5. Step 5: Solve for x
    x = 592,345.12/729.41
  6. Step 6: Final answer
    x = 812.09

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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.