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Finding the Fourth Proportional to 1,785.84, 2,679.13 and 553.22

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Solution

The fourth proportional to 1,785.84, 2,679.13 and 553.22 is: 829.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.84 : 2,679.13 = 553.22 : x
  2. Step 2: Convert to fraction form
    1,785.84/2,679.13 = 553.22/x
  3. Step 3: Cross multiply
    1,785.84x = 2,679.13 × 553.22
  4. Step 4: Simplify right side
    1,785.84x = 1,482,148.30
  5. Step 5: Solve for x
    x = 1,482,148.30/1,785.84
  6. Step 6: Final answer
    x = 829.94

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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.