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Finding the Fourth Proportional to 525.30, 724.90 and 289.25

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Solution

The fourth proportional to 525.30, 724.90 and 289.25 is: 399.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.30 : 724.90 = 289.25 : x
  2. Step 2: Convert to fraction form
    525.30/724.90 = 289.25/x
  3. Step 3: Cross multiply
    525.30x = 724.90 × 289.25
  4. Step 4: Simplify right side
    525.30x = 209,677.33
  5. Step 5: Solve for x
    x = 209,677.33/525.30
  6. Step 6: Final answer
    x = 399.16

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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.