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Finding the Fourth Proportional to 1,137.20, 1,568.76 and 964.40

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Solution

The fourth proportional to 1,137.20, 1,568.76 and 964.40 is: 1,330.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.20 : 1,568.76 = 964.40 : x
  2. Step 2: Convert to fraction form
    1,137.20/1,568.76 = 964.40/x
  3. Step 3: Cross multiply
    1,137.20x = 1,568.76 × 964.40
  4. Step 4: Simplify right side
    1,137.20x = 1,512,912.14
  5. Step 5: Solve for x
    x = 1,512,912.14/1,137.20
  6. Step 6: Final answer
    x = 1,330.38

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1.5x scale

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.