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Finding the Fourth Proportional to 1,785.85, 2,679.54 and 690.99

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Solution

The fourth proportional to 1,785.85, 2,679.54 and 690.99 is: 1,036.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.85 : 2,679.54 = 690.99 : x
  2. Step 2: Convert to fraction form
    1,785.85/2,679.54 = 690.99/x
  3. Step 3: Cross multiply
    1,785.85x = 2,679.54 × 690.99
  4. Step 4: Simplify right side
    1,785.85x = 1,851,521.95
  5. Step 5: Solve for x
    x = 1,851,521.95/1,785.85
  6. Step 6: Final answer
    x = 1,036.77

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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.