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Finding the Fourth Proportional to 935.28, 1,401.60 and 689.88

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Solution

The fourth proportional to 935.28, 1,401.60 and 689.88 is: 1,033.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.28 : 1,401.60 = 689.88 : x
  2. Step 2: Convert to fraction form
    935.28/1,401.60 = 689.88/x
  3. Step 3: Cross multiply
    935.28x = 1,401.60 × 689.88
  4. Step 4: Simplify right side
    935.28x = 966,935.81
  5. Step 5: Solve for x
    x = 966,935.81/935.28
  6. Step 6: Final answer
    x = 1,033.85

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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.