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Finding the Fourth Proportional to 523.69, 785.65 and 215.57

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Solution

The fourth proportional to 523.69, 785.65 and 215.57 is: 323.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.69 : 785.65 = 215.57 : x
  2. Step 2: Convert to fraction form
    523.69/785.65 = 215.57/x
  3. Step 3: Cross multiply
    523.69x = 785.65 × 215.57
  4. Step 4: Simplify right side
    523.69x = 169,362.57
  5. Step 5: Solve for x
    x = 169,362.57/523.69
  6. Step 6: Final answer
    x = 323.40

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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.