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Finding the Fourth Proportional to 1,686.78, 2,324.70 and 1,639.44

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Solution

The fourth proportional to 1,686.78, 2,324.70 and 1,639.44 is: 2,259.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.78 : 2,324.70 = 1,639.44 : x
  2. Step 2: Convert to fraction form
    1,686.78/2,324.70 = 1,639.44/x
  3. Step 3: Cross multiply
    1,686.78x = 2,324.70 × 1,639.44
  4. Step 4: Simplify right side
    1,686.78x = 3,811,206.17
  5. Step 5: Solve for x
    x = 3,811,206.17/1,686.78
  6. Step 6: Final answer
    x = 2,259.46

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1.5x scale

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.