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Finding the Fourth Proportional to 1,121.49, 1,547.15 and 679.23

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Solution

The fourth proportional to 1,121.49, 1,547.15 and 679.23 is: 937.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.49 : 1,547.15 = 679.23 : x
  2. Step 2: Convert to fraction form
    1,121.49/1,547.15 = 679.23/x
  3. Step 3: Cross multiply
    1,121.49x = 1,547.15 × 679.23
  4. Step 4: Simplify right side
    1,121.49x = 1,050,867.30
  5. Step 5: Solve for x
    x = 1,050,867.30/1,121.49
  6. Step 6: Final answer
    x = 937.03

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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.