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Finding the Fourth Proportional to 838.94, 1,258.54 and 291.11

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Solution

The fourth proportional to 838.94, 1,258.54 and 291.11 is: 436.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.94 : 1,258.54 = 291.11 : x
  2. Step 2: Convert to fraction form
    838.94/1,258.54 = 291.11/x
  3. Step 3: Cross multiply
    838.94x = 1,258.54 × 291.11
  4. Step 4: Simplify right side
    838.94x = 366,366.56
  5. Step 5: Solve for x
    x = 366,366.56/838.94
  6. Step 6: Final answer
    x = 436.70

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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.