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Finding the Fourth Proportional to 1,157.11, 1,737.20 and 689.45

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Solution

The fourth proportional to 1,157.11, 1,737.20 and 689.45 is: 1,035.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.11 : 1,737.20 = 689.45 : x
  2. Step 2: Convert to fraction form
    1,157.11/1,737.20 = 689.45/x
  3. Step 3: Cross multiply
    1,157.11x = 1,737.20 × 689.45
  4. Step 4: Simplify right side
    1,157.11x = 1,197,700.41
  5. Step 5: Solve for x
    x = 1,197,700.41/1,157.11
  6. Step 6: Final answer
    x = 1,035.08

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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.