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Finding the Fourth Proportional to 346.98, 478.78 and 207.12

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Solution

The fourth proportional to 346.98, 478.78 and 207.12 is: 285.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.98 : 478.78 = 207.12 : x
  2. Step 2: Convert to fraction form
    346.98/478.78 = 207.12/x
  3. Step 3: Cross multiply
    346.98x = 478.78 × 207.12
  4. Step 4: Simplify right side
    346.98x = 99,166.19
  5. Step 5: Solve for x
    x = 99,166.19/346.98
  6. Step 6: Final answer
    x = 285.79

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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.