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Finding the Fourth Proportional to 922.12, 1,273.62 and 661.30

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Solution

The fourth proportional to 922.12, 1,273.62 and 661.30 is: 913.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.12 : 1,273.62 = 661.30 : x
  2. Step 2: Convert to fraction form
    922.12/1,273.62 = 661.30/x
  3. Step 3: Cross multiply
    922.12x = 1,273.62 × 661.30
  4. Step 4: Simplify right side
    922.12x = 842,244.20
  5. Step 5: Solve for x
    x = 842,244.20/922.12
  6. Step 6: Final answer
    x = 913.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.