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Finding the Fourth Proportional to 1,679.49, 2,520.80 and 858.35

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Solution

The fourth proportional to 1,679.49, 2,520.80 and 858.35 is: 1,288.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.49 : 2,520.80 = 858.35 : x
  2. Step 2: Convert to fraction form
    1,679.49/2,520.80 = 858.35/x
  3. Step 3: Cross multiply
    1,679.49x = 2,520.80 × 858.35
  4. Step 4: Simplify right side
    1,679.49x = 2,163,737.13
  5. Step 5: Solve for x
    x = 2,163,737.13/1,679.49
  6. Step 6: Final answer
    x = 1,288.33

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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.