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Finding the Fourth Proportional to 523.20, 785.40 and 306.90

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Solution

The fourth proportional to 523.20, 785.40 and 306.90 is: 460.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.20 : 785.40 = 306.90 : x
  2. Step 2: Convert to fraction form
    523.20/785.40 = 306.90/x
  3. Step 3: Cross multiply
    523.20x = 785.40 × 306.90
  4. Step 4: Simplify right side
    523.20x = 241,039.26
  5. Step 5: Solve for x
    x = 241,039.26/523.20
  6. Step 6: Final answer
    x = 460.70

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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.