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Finding the Fourth Proportional to 346.74, 477.90 and 247.15

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Solution

The fourth proportional to 346.74, 477.90 and 247.15 is: 340.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.74 : 477.90 = 247.15 : x
  2. Step 2: Convert to fraction form
    346.74/477.90 = 247.15/x
  3. Step 3: Cross multiply
    346.74x = 477.90 × 247.15
  4. Step 4: Simplify right side
    346.74x = 118,112.99
  5. Step 5: Solve for x
    x = 118,112.99/346.74
  6. Step 6: Final answer
    x = 340.64

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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.