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Finding the Fourth Proportional to 472.21, 651.72 and 285.70

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Solution

The fourth proportional to 472.21, 651.72 and 285.70 is: 394.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.21 : 651.72 = 285.70 : x
  2. Step 2: Convert to fraction form
    472.21/651.72 = 285.70/x
  3. Step 3: Cross multiply
    472.21x = 651.72 × 285.70
  4. Step 4: Simplify right side
    472.21x = 186,196.40
  5. Step 5: Solve for x
    x = 186,196.40/472.21
  6. Step 6: Final answer
    x = 394.31

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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.