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Finding the Fourth Proportional to 1,785.90, 2,679.30 and 553.44

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Solution

The fourth proportional to 1,785.90, 2,679.30 and 553.44 is: 830.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.90 : 2,679.30 = 553.44 : x
  2. Step 2: Convert to fraction form
    1,785.90/2,679.30 = 553.44/x
  3. Step 3: Cross multiply
    1,785.90x = 2,679.30 × 553.44
  4. Step 4: Simplify right side
    1,785.90x = 1,482,831.79
  5. Step 5: Solve for x
    x = 1,482,831.79/1,785.90
  6. Step 6: Final answer
    x = 830.30

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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.