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Finding the Fourth Proportional to 838.62, 1,157.49 and 489.51

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Solution

The fourth proportional to 838.62, 1,157.49 and 489.51 is: 675.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.62 : 1,157.49 = 489.51 : x
  2. Step 2: Convert to fraction form
    838.62/1,157.49 = 489.51/x
  3. Step 3: Cross multiply
    838.62x = 1,157.49 × 489.51
  4. Step 4: Simplify right side
    838.62x = 566,602.93
  5. Step 5: Solve for x
    x = 566,602.93/838.62
  6. Step 6: Final answer
    x = 675.64

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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.