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Finding the Fourth Proportional to 524.20, 785.40 and 427.72

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Solution

The fourth proportional to 524.20, 785.40 and 427.72 is: 640.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    524.20 : 785.40 = 427.72 : x
  2. Step 2: Convert to fraction form
    524.20/785.40 = 427.72/x
  3. Step 3: Cross multiply
    524.20x = 785.40 × 427.72
  4. Step 4: Simplify right side
    524.20x = 335,931.29
  5. Step 5: Solve for x
    x = 335,931.29/524.20
  6. Step 6: Final answer
    x = 640.85

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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.