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Finding the Fourth Proportional to 900.45, 1,349.98 and 808.87

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Solution

The fourth proportional to 900.45, 1,349.98 and 808.87 is: 1,212.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.45 : 1,349.98 = 808.87 : x
  2. Step 2: Convert to fraction form
    900.45/1,349.98 = 808.87/x
  3. Step 3: Cross multiply
    900.45x = 1,349.98 × 808.87
  4. Step 4: Simplify right side
    900.45x = 1,091,947.53
  5. Step 5: Solve for x
    x = 1,091,947.53/900.45
  6. Step 6: Final answer
    x = 1,212.68

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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.