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Finding the Fourth Proportional to 911.07, 1,364.55 and 423.09

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Solution

The fourth proportional to 911.07, 1,364.55 and 423.09 is: 633.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.07 : 1,364.55 = 423.09 : x
  2. Step 2: Convert to fraction form
    911.07/1,364.55 = 423.09/x
  3. Step 3: Cross multiply
    911.07x = 1,364.55 × 423.09
  4. Step 4: Simplify right side
    911.07x = 577,332.58
  5. Step 5: Solve for x
    x = 577,332.58/911.07
  6. Step 6: Final answer
    x = 633.69

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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.