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Finding the Fourth Proportional to 839.34, 1,258.30 and 400.35

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Solution

The fourth proportional to 839.34, 1,258.30 and 400.35 is: 600.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.34 : 1,258.30 = 400.35 : x
  2. Step 2: Convert to fraction form
    839.34/1,258.30 = 400.35/x
  3. Step 3: Cross multiply
    839.34x = 1,258.30 × 400.35
  4. Step 4: Simplify right side
    839.34x = 503,760.41
  5. Step 5: Solve for x
    x = 503,760.41/839.34
  6. Step 6: Final answer
    x = 600.19

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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.