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Finding the Fourth Proportional to 525.28, 724.88 and 289.22

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Solution

The fourth proportional to 525.28, 724.88 and 289.22 is: 399.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.28 : 724.88 = 289.22 : x
  2. Step 2: Convert to fraction form
    525.28/724.88 = 289.22/x
  3. Step 3: Cross multiply
    525.28x = 724.88 × 289.22
  4. Step 4: Simplify right side
    525.28x = 209,649.79
  5. Step 5: Solve for x
    x = 209,649.79/525.28
  6. Step 6: Final answer
    x = 399.12

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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.