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Finding the Fourth Proportional to 1,121.72, 1,547.98 and 679.31

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Solution

The fourth proportional to 1,121.72, 1,547.98 and 679.31 is: 937.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.72 : 1,547.98 = 679.31 : x
  2. Step 2: Convert to fraction form
    1,121.72/1,547.98 = 679.31/x
  3. Step 3: Cross multiply
    1,121.72x = 1,547.98 × 679.31
  4. Step 4: Simplify right side
    1,121.72x = 1,051,558.29
  5. Step 5: Solve for x
    x = 1,051,558.29/1,121.72
  6. Step 6: Final answer
    x = 937.45

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.