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Finding the Fourth Proportional to 1,121.59, 1,547.37 and 679.33

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Solution

The fourth proportional to 1,121.59, 1,547.37 and 679.33 is: 937.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.59 : 1,547.37 = 679.33 : x
  2. Step 2: Convert to fraction form
    1,121.59/1,547.37 = 679.33/x
  3. Step 3: Cross multiply
    1,121.59x = 1,547.37 × 679.33
  4. Step 4: Simplify right side
    1,121.59x = 1,051,174.86
  5. Step 5: Solve for x
    x = 1,051,174.86/1,121.59
  6. Step 6: Final answer
    x = 937.22

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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.