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Finding the Fourth Proportional to 911.68, 1,365.72 and 424.06

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Solution

The fourth proportional to 911.68, 1,365.72 and 424.06 is: 635.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.68 : 1,365.72 = 424.06 : x
  2. Step 2: Convert to fraction form
    911.68/1,365.72 = 424.06/x
  3. Step 3: Cross multiply
    911.68x = 1,365.72 × 424.06
  4. Step 4: Simplify right side
    911.68x = 579,147.22
  5. Step 5: Solve for x
    x = 579,147.22/911.68
  6. Step 6: Final answer
    x = 635.25

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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.