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Finding the Fourth Proportional to 1,121.40, 1,547.67 and 679.30

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Solution

The fourth proportional to 1,121.40, 1,547.67 and 679.30 is: 937.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,547.67 = 679.30 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,547.67 = 679.30/x
  3. Step 3: Cross multiply
    1,121.40x = 1,547.67 × 679.30
  4. Step 4: Simplify right side
    1,121.40x = 1,051,337.80
  5. Step 5: Solve for x
    x = 1,051,337.80/1,121.40
  6. Step 6: Final answer
    x = 937.52

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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.