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Finding the Fourth Proportional to 1,121.51, 1,547.71 and 679.32

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Solution

The fourth proportional to 1,121.51, 1,547.71 and 679.32 is: 937.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.51 : 1,547.71 = 679.32 : x
  2. Step 2: Convert to fraction form
    1,121.51/1,547.71 = 679.32/x
  3. Step 3: Cross multiply
    1,121.51x = 1,547.71 × 679.32
  4. Step 4: Simplify right side
    1,121.51x = 1,051,388.66
  5. Step 5: Solve for x
    x = 1,051,388.66/1,121.51
  6. Step 6: Final answer
    x = 937.47

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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.