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Finding the Fourth Proportional to 475.15, 712.80 and 215.24

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Solution

The fourth proportional to 475.15, 712.80 and 215.24 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.15 : 712.80 = 215.24 : x
  2. Step 2: Convert to fraction form
    475.15/712.80 = 215.24/x
  3. Step 3: Cross multiply
    475.15x = 712.80 × 215.24
  4. Step 4: Simplify right side
    475.15x = 153,422.00
  5. Step 5: Solve for x
    x = 153,422.00/475.15
  6. Step 6: Final answer
    x = 322.89

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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.