Home / 1,687.45-2,531.15-533.20

Finding the Fourth Proportional to 1,687.45, 2,531.15 and 533.20

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Solution

The fourth proportional to 1,687.45, 2,531.15 and 533.20 is: 799.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.45 : 2,531.15 = 533.20 : x
  2. Step 2: Convert to fraction form
    1,687.45/2,531.15 = 533.20/x
  3. Step 3: Cross multiply
    1,687.45x = 2,531.15 × 533.20
  4. Step 4: Simplify right side
    1,687.45x = 1,349,597.86
  5. Step 5: Solve for x
    x = 1,349,597.86/1,687.45
  6. Step 6: Final answer
    x = 799.79

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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.