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Finding the Fourth Proportional to 1,137.40, 1,568.90 and 717.40

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Solution

The fourth proportional to 1,137.40, 1,568.90 and 717.40 is: 989.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.40 : 1,568.90 = 717.40 : x
  2. Step 2: Convert to fraction form
    1,137.40/1,568.90 = 717.40/x
  3. Step 3: Cross multiply
    1,137.40x = 1,568.90 × 717.40
  4. Step 4: Simplify right side
    1,137.40x = 1,125,528.86
  5. Step 5: Solve for x
    x = 1,125,528.86/1,137.40
  6. Step 6: Final answer
    x = 989.56

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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.