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Finding the Fourth Proportional to 314.88, 472.80 and 261.12

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Solution

The fourth proportional to 314.88, 472.80 and 261.12 is: 392.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.88 : 472.80 = 261.12 : x
  2. Step 2: Convert to fraction form
    314.88/472.80 = 261.12/x
  3. Step 3: Cross multiply
    314.88x = 472.80 × 261.12
  4. Step 4: Simplify right side
    314.88x = 123,457.54
  5. Step 5: Solve for x
    x = 123,457.54/314.88
  6. Step 6: Final answer
    x = 392.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.