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Finding the Fourth Proportional to 346.68, 478.40 and 206.81

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Solution

The fourth proportional to 346.68, 478.40 and 206.81 is: 285.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.68 : 478.40 = 206.81 : x
  2. Step 2: Convert to fraction form
    346.68/478.40 = 206.81/x
  3. Step 3: Cross multiply
    346.68x = 478.40 × 206.81
  4. Step 4: Simplify right side
    346.68x = 98,937.90
  5. Step 5: Solve for x
    x = 98,937.90/346.68
  6. Step 6: Final answer
    x = 285.39

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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.