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Finding the Fourth Proportional to 1,157.12, 1,726 and 1,120.64

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Solution

The fourth proportional to 1,157.12, 1,726 and 1,120.64 is: 1,671.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.12 : 1,726 = 1,120.64 : x
  2. Step 2: Convert to fraction form
    1,157.12/1,726 = 1,120.64/x
  3. Step 3: Cross multiply
    1,157.12x = 1,726 × 1,120.64
  4. Step 4: Simplify right side
    1,157.12x = 1,934,224.64
  5. Step 5: Solve for x
    x = 1,934,224.64/1,157.12
  6. Step 6: Final answer
    x = 1,671.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.