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Finding the Fourth Proportional to 908.72, 1,363.13 and 259.50

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Solution

The fourth proportional to 908.72, 1,363.13 and 259.50 is: 389.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.72 : 1,363.13 = 259.50 : x
  2. Step 2: Convert to fraction form
    908.72/1,363.13 = 259.50/x
  3. Step 3: Cross multiply
    908.72x = 1,363.13 × 259.50
  4. Step 4: Simplify right side
    908.72x = 353,737.02
  5. Step 5: Solve for x
    x = 353,737.02/908.72
  6. Step 6: Final answer
    x = 389.27

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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.