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Finding the Fourth Proportional to 523.56, 784.80 and 215.28

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Solution

The fourth proportional to 523.56, 784.80 and 215.28 is: 322.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.56 : 784.80 = 215.28 : x
  2. Step 2: Convert to fraction form
    523.56/784.80 = 215.28/x
  3. Step 3: Cross multiply
    523.56x = 784.80 × 215.28
  4. Step 4: Simplify right side
    523.56x = 168,951.74
  5. Step 5: Solve for x
    x = 168,951.74/523.56
  6. Step 6: Final answer
    x = 322.70

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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.