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Finding the Fourth Proportional to 935.40, 1,401.96 and 661.57

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Solution

The fourth proportional to 935.40, 1,401.96 and 661.57 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.40 : 1,401.96 = 661.57 : x
  2. Step 2: Convert to fraction form
    935.40/1,401.96 = 661.57/x
  3. Step 3: Cross multiply
    935.40x = 1,401.96 × 661.57
  4. Step 4: Simplify right side
    935.40x = 927,489.93
  5. Step 5: Solve for x
    x = 927,489.93/935.40
  6. Step 6: Final answer
    x = 991.55

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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.