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Finding the Fourth Proportional to 838.84, 1,157.76 and 489.58

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Solution

The fourth proportional to 838.84, 1,157.76 and 489.58 is: 675.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.84 : 1,157.76 = 489.58 : x
  2. Step 2: Convert to fraction form
    838.84/1,157.76 = 489.58/x
  3. Step 3: Cross multiply
    838.84x = 1,157.76 × 489.58
  4. Step 4: Simplify right side
    838.84x = 566,816.14
  5. Step 5: Solve for x
    x = 566,816.14/838.84
  6. Step 6: Final answer
    x = 675.71

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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.