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Finding the Fourth Proportional to 842.10, 1,263.50 and 379.56

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Solution

The fourth proportional to 842.10, 1,263.50 and 379.56 is: 569.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.10 : 1,263.50 = 379.56 : x
  2. Step 2: Convert to fraction form
    842.10/1,263.50 = 379.56/x
  3. Step 3: Cross multiply
    842.10x = 1,263.50 × 379.56
  4. Step 4: Simplify right side
    842.10x = 479,574.06
  5. Step 5: Solve for x
    x = 479,574.06/842.10
  6. Step 6: Final answer
    x = 569.50

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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.