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Finding the Fourth Proportional to 1,686.78, 2,328.20 and 1,520.70

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Solution

The fourth proportional to 1,686.78, 2,328.20 and 1,520.70 is: 2,098.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.78 : 2,328.20 = 1,520.70 : x
  2. Step 2: Convert to fraction form
    1,686.78/2,328.20 = 1,520.70/x
  3. Step 3: Cross multiply
    1,686.78x = 2,328.20 × 1,520.70
  4. Step 4: Simplify right side
    1,686.78x = 3,540,486.14
  5. Step 5: Solve for x
    x = 3,540,486.14/1,686.78
  6. Step 6: Final answer
    x = 2,098.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.