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Finding the Fourth Proportional to 1,686.54, 2,531.39 and 1,038.54

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Solution

The fourth proportional to 1,686.54, 2,531.39 and 1,038.54 is: 1,558.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.54 : 2,531.39 = 1,038.54 : x
  2. Step 2: Convert to fraction form
    1,686.54/2,531.39 = 1,038.54/x
  3. Step 3: Cross multiply
    1,686.54x = 2,531.39 × 1,038.54
  4. Step 4: Simplify right side
    1,686.54x = 2,628,949.77
  5. Step 5: Solve for x
    x = 2,628,949.77/1,686.54
  6. Step 6: Final answer
    x = 1,558.78

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1.5x scale

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.