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Finding the Fourth Proportional to 346.22, 478.05 and 215.45

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Solution

The fourth proportional to 346.22, 478.05 and 215.45 is: 297.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.22 : 478.05 = 215.45 : x
  2. Step 2: Convert to fraction form
    346.22/478.05 = 215.45/x
  3. Step 3: Cross multiply
    346.22x = 478.05 × 215.45
  4. Step 4: Simplify right side
    346.22x = 102,995.87
  5. Step 5: Solve for x
    x = 102,995.87/346.22
  6. Step 6: Final answer
    x = 297.49

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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.