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Finding the Fourth Proportional to 346.39, 478.08 and 215.41

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Solution

The fourth proportional to 346.39, 478.08 and 215.41 is: 297.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.39 : 478.08 = 215.41 : x
  2. Step 2: Convert to fraction form
    346.39/478.08 = 215.41/x
  3. Step 3: Cross multiply
    346.39x = 478.08 × 215.41
  4. Step 4: Simplify right side
    346.39x = 102,983.21
  5. Step 5: Solve for x
    x = 102,983.21/346.39
  6. Step 6: Final answer
    x = 297.30

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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.