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Finding the Fourth Proportional to 346.30, 478.20 and 215.53

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Solution

The fourth proportional to 346.30, 478.20 and 215.53 is: 297.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.30 : 478.20 = 215.53 : x
  2. Step 2: Convert to fraction form
    346.30/478.20 = 215.53/x
  3. Step 3: Cross multiply
    346.30x = 478.20 × 215.53
  4. Step 4: Simplify right side
    346.30x = 103,066.45
  5. Step 5: Solve for x
    x = 103,066.45/346.30
  6. Step 6: Final answer
    x = 297.62

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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.