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Finding the Fourth Proportional to 346.32, 478.04 and 215.28

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Solution

The fourth proportional to 346.32, 478.04 and 215.28 is: 297.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.32 : 478.04 = 215.28 : x
  2. Step 2: Convert to fraction form
    346.32/478.04 = 215.28/x
  3. Step 3: Cross multiply
    346.32x = 478.04 × 215.28
  4. Step 4: Simplify right side
    346.32x = 102,912.45
  5. Step 5: Solve for x
    x = 102,912.45/346.32
  6. Step 6: Final answer
    x = 297.16

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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.