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Finding the Fourth Proportional to 900.23, 1,349.90 and 438.04

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Solution

The fourth proportional to 900.23, 1,349.90 and 438.04 is: 656.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.23 : 1,349.90 = 438.04 : x
  2. Step 2: Convert to fraction form
    900.23/1,349.90 = 438.04/x
  3. Step 3: Cross multiply
    900.23x = 1,349.90 × 438.04
  4. Step 4: Simplify right side
    900.23x = 591,301.26
  5. Step 5: Solve for x
    x = 591,301.26/900.23
  6. Step 6: Final answer
    x = 656.83

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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.