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Finding the Fourth Proportional to 909.70, 1,364.55 and 808.90

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Solution

The fourth proportional to 909.70, 1,364.55 and 808.90 is: 1,213.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.70 : 1,364.55 = 808.90 : x
  2. Step 2: Convert to fraction form
    909.70/1,364.55 = 808.90/x
  3. Step 3: Cross multiply
    909.70x = 1,364.55 × 808.90
  4. Step 4: Simplify right side
    909.70x = 1,103,784.50
  5. Step 5: Solve for x
    x = 1,103,784.50/909.70
  6. Step 6: Final answer
    x = 1,213.35

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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.