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Finding the Fourth Proportional to 909.30, 1,363.81 and 259.89

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Solution

The fourth proportional to 909.30, 1,363.81 and 259.89 is: 389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.30 : 1,363.81 = 259.89 : x
  2. Step 2: Convert to fraction form
    909.30/1,363.81 = 259.89/x
  3. Step 3: Cross multiply
    909.30x = 1,363.81 × 259.89
  4. Step 4: Simplify right side
    909.30x = 354,440.58
  5. Step 5: Solve for x
    x = 354,440.58/909.30
  6. Step 6: Final answer
    x = 389.79

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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.