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Finding the Fourth Proportional to 346.65, 478.31 and 215.60

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Solution

The fourth proportional to 346.65, 478.31 and 215.60 is: 297.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.65 : 478.31 = 215.60 : x
  2. Step 2: Convert to fraction form
    346.65/478.31 = 215.60/x
  3. Step 3: Cross multiply
    346.65x = 478.31 × 215.60
  4. Step 4: Simplify right side
    346.65x = 103,120.17
  5. Step 5: Solve for x
    x = 103,120.17/346.65
  6. Step 6: Final answer
    x = 297.48

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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.