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Finding the Fourth Proportional to 909.90, 1,363.17 and 808.23

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Solution

The fourth proportional to 909.90, 1,363.17 and 808.23 is: 1,210.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.90 : 1,363.17 = 808.23 : x
  2. Step 2: Convert to fraction form
    909.90/1,363.17 = 808.23/x
  3. Step 3: Cross multiply
    909.90x = 1,363.17 × 808.23
  4. Step 4: Simplify right side
    909.90x = 1,101,754.89
  5. Step 5: Solve for x
    x = 1,101,754.89/909.90
  6. Step 6: Final answer
    x = 1,210.85

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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.