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Finding the Fourth Proportional to 934.58, 1,398.36 and 661.34

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Solution

The fourth proportional to 934.58, 1,398.36 and 661.34 is: 989.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.58 : 1,398.36 = 661.34 : x
  2. Step 2: Convert to fraction form
    934.58/1,398.36 = 661.34/x
  3. Step 3: Cross multiply
    934.58x = 1,398.36 × 661.34
  4. Step 4: Simplify right side
    934.58x = 924,791.40
  5. Step 5: Solve for x
    x = 924,791.40/934.58
  6. Step 6: Final answer
    x = 989.53

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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.