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Finding the Fourth Proportional to 347.40, 478.86 and 258.84

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Solution

The fourth proportional to 347.40, 478.86 and 258.84 is: 356.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.40 : 478.86 = 258.84 : x
  2. Step 2: Convert to fraction form
    347.40/478.86 = 258.84/x
  3. Step 3: Cross multiply
    347.40x = 478.86 × 258.84
  4. Step 4: Simplify right side
    347.40x = 123,948.12
  5. Step 5: Solve for x
    x = 123,948.12/347.40
  6. Step 6: Final answer
    x = 356.79

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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.