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Finding the Fourth Proportional to 1,786.19, 2,679.28 and 631.13

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Solution

The fourth proportional to 1,786.19, 2,679.28 and 631.13 is: 946.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.19 : 2,679.28 = 631.13 : x
  2. Step 2: Convert to fraction form
    1,786.19/2,679.28 = 631.13/x
  3. Step 3: Cross multiply
    1,786.19x = 2,679.28 × 631.13
  4. Step 4: Simplify right side
    1,786.19x = 1,690,959.01
  5. Step 5: Solve for x
    x = 1,690,959.01/1,786.19
  6. Step 6: Final answer
    x = 946.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.