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Finding the Fourth Proportional to 843.56, 1,263.36 and 431.66

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Solution

The fourth proportional to 843.56, 1,263.36 and 431.66 is: 646.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.56 : 1,263.36 = 431.66 : x
  2. Step 2: Convert to fraction form
    843.56/1,263.36 = 431.66/x
  3. Step 3: Cross multiply
    843.56x = 1,263.36 × 431.66
  4. Step 4: Simplify right side
    843.56x = 545,341.98
  5. Step 5: Solve for x
    x = 545,341.98/843.56
  6. Step 6: Final answer
    x = 646.48

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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.