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Finding the Fourth Proportional to 832, 1,247.64 and 420.93

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Solution

The fourth proportional to 832, 1,247.64 and 420.93 is: 631.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    832 : 1,247.64 = 420.93 : x
  2. Step 2: Convert to fraction form
    832/1,247.64 = 420.93/x
  3. Step 3: Cross multiply
    832x = 1,247.64 × 420.93
  4. Step 4: Simplify right side
    832x = 525,169.11
  5. Step 5: Solve for x
    x = 525,169.11/832
  6. Step 6: Final answer
    x = 631.21

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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.