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Finding the Fourth Proportional to 934.30, 1,402.80 and 661.60

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Solution

The fourth proportional to 934.30, 1,402.80 and 661.60 is: 993.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.30 : 1,402.80 = 661.60 : x
  2. Step 2: Convert to fraction form
    934.30/1,402.80 = 661.60/x
  3. Step 3: Cross multiply
    934.30x = 1,402.80 × 661.60
  4. Step 4: Simplify right side
    934.30x = 928,092.48
  5. Step 5: Solve for x
    x = 928,092.48/934.30
  6. Step 6: Final answer
    x = 993.36

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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.