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Finding the Fourth Proportional to 313.80, 472.61 and 285.24

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Solution

The fourth proportional to 313.80, 472.61 and 285.24 is: 429.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.80 : 472.61 = 285.24 : x
  2. Step 2: Convert to fraction form
    313.80/472.61 = 285.24/x
  3. Step 3: Cross multiply
    313.80x = 472.61 × 285.24
  4. Step 4: Simplify right side
    313.80x = 134,807.28
  5. Step 5: Solve for x
    x = 134,807.28/313.80
  6. Step 6: Final answer
    x = 429.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.