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Finding the Fourth Proportional to 1,121.38, 1,547.77 and 679.19

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Solution

The fourth proportional to 1,121.38, 1,547.77 and 679.19 is: 937.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.38 : 1,547.77 = 679.19 : x
  2. Step 2: Convert to fraction form
    1,121.38/1,547.77 = 679.19/x
  3. Step 3: Cross multiply
    1,121.38x = 1,547.77 × 679.19
  4. Step 4: Simplify right side
    1,121.38x = 1,051,226.51
  5. Step 5: Solve for x
    x = 1,051,226.51/1,121.38
  6. Step 6: Final answer
    x = 937.44

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1.5x scale

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.