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Finding the Fourth Proportional to 838.71, 1,157.49 and 489.39

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Solution

The fourth proportional to 838.71, 1,157.49 and 489.39 is: 675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.71 : 1,157.49 = 489.39 : x
  2. Step 2: Convert to fraction form
    838.71/1,157.49 = 489.39/x
  3. Step 3: Cross multiply
    838.71x = 1,157.49 × 489.39
  4. Step 4: Simplify right side
    838.71x = 566,464.03
  5. Step 5: Solve for x
    x = 566,464.03/838.71
  6. Step 6: Final answer
    x = 675.40

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1.5x scale

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.