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Finding the Fourth Proportional to 911.04, 1,364.50 and 638.35

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Solution

The fourth proportional to 911.04, 1,364.50 and 638.35 is: 956.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.04 : 1,364.50 = 638.35 : x
  2. Step 2: Convert to fraction form
    911.04/1,364.50 = 638.35/x
  3. Step 3: Cross multiply
    911.04x = 1,364.50 × 638.35
  4. Step 4: Simplify right side
    911.04x = 871,021.75
  5. Step 5: Solve for x
    x = 871,021.75/911.04
  6. Step 6: Final answer
    x = 956.08

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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.