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Finding the Fourth Proportional to 838.87, 1,157.63 and 465.85

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Solution

The fourth proportional to 838.87, 1,157.63 and 465.85 is: 642.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.87 : 1,157.63 = 465.85 : x
  2. Step 2: Convert to fraction form
    838.87/1,157.63 = 465.85/x
  3. Step 3: Cross multiply
    838.87x = 1,157.63 × 465.85
  4. Step 4: Simplify right side
    838.87x = 539,273.82
  5. Step 5: Solve for x
    x = 539,273.82/838.87
  6. Step 6: Final answer
    x = 642.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.