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Finding the Fourth Proportional to 838.90, 1,258.35 and 492.40

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Solution

The fourth proportional to 838.90, 1,258.35 and 492.40 is: 738.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.90 : 1,258.35 = 492.40 : x
  2. Step 2: Convert to fraction form
    838.90/1,258.35 = 492.40/x
  3. Step 3: Cross multiply
    838.90x = 1,258.35 × 492.40
  4. Step 4: Simplify right side
    838.90x = 619,611.54
  5. Step 5: Solve for x
    x = 619,611.54/838.90
  6. Step 6: Final answer
    x = 738.60

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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.