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Finding the Fourth Proportional to 832, 1,247.28 and 420.88

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Solution

The fourth proportional to 832, 1,247.28 and 420.88 is: 630.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    832 : 1,247.28 = 420.88 : x
  2. Step 2: Convert to fraction form
    832/1,247.28 = 420.88/x
  3. Step 3: Cross multiply
    832x = 1,247.28 × 420.88
  4. Step 4: Simplify right side
    832x = 524,955.21
  5. Step 5: Solve for x
    x = 524,955.21/832
  6. Step 6: Final answer
    x = 630.96

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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.