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Finding the Fourth Proportional to 890.81, 1,335.49 and 548.09

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Solution

The fourth proportional to 890.81, 1,335.49 and 548.09 is: 821.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.81 : 1,335.49 = 548.09 : x
  2. Step 2: Convert to fraction form
    890.81/1,335.49 = 548.09/x
  3. Step 3: Cross multiply
    890.81x = 1,335.49 × 548.09
  4. Step 4: Simplify right side
    890.81x = 731,968.71
  5. Step 5: Solve for x
    x = 731,968.71/890.81
  6. Step 6: Final answer
    x = 821.69

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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.