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Finding the Fourth Proportional to 838.91, 1,258.54 and 345.32

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Solution

The fourth proportional to 838.91, 1,258.54 and 345.32 is: 518.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.91 : 1,258.54 = 345.32 : x
  2. Step 2: Convert to fraction form
    838.91/1,258.54 = 345.32/x
  3. Step 3: Cross multiply
    838.91x = 1,258.54 × 345.32
  4. Step 4: Simplify right side
    838.91x = 434,599.03
  5. Step 5: Solve for x
    x = 434,599.03/838.91
  6. Step 6: Final answer
    x = 518.05

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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.