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Finding the Fourth Proportional to 1,145.03, 1,578.95 and 979.79

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Solution

The fourth proportional to 1,145.03, 1,578.95 and 979.79 is: 1,351.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.03 : 1,578.95 = 979.79 : x
  2. Step 2: Convert to fraction form
    1,145.03/1,578.95 = 979.79/x
  3. Step 3: Cross multiply
    1,145.03x = 1,578.95 × 979.79
  4. Step 4: Simplify right side
    1,145.03x = 1,547,039.42
  5. Step 5: Solve for x
    x = 1,547,039.42/1,145.03
  6. Step 6: Final answer
    x = 1,351.09

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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.