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Finding the Fourth Proportional to 1,642.85, 2,462.96 and 820.70

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Solution

The fourth proportional to 1,642.85, 2,462.96 and 820.70 is: 1,230.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.85 : 2,462.96 = 820.70 : x
  2. Step 2: Convert to fraction form
    1,642.85/2,462.96 = 820.70/x
  3. Step 3: Cross multiply
    1,642.85x = 2,462.96 × 820.70
  4. Step 4: Simplify right side
    1,642.85x = 2,021,334.85
  5. Step 5: Solve for x
    x = 2,021,334.85/1,642.85
  6. Step 6: Final answer
    x = 1,230.39

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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.