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Finding the Fourth Proportional to 271.47, 407.21 and 117.42

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Solution

The fourth proportional to 271.47, 407.21 and 117.42 is: 176.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.47 : 407.21 = 117.42 : x
  2. Step 2: Convert to fraction form
    271.47/407.21 = 117.42/x
  3. Step 3: Cross multiply
    271.47x = 407.21 × 117.42
  4. Step 4: Simplify right side
    271.47x = 47,814.01
  5. Step 5: Solve for x
    x = 47,814.01/271.47
  6. Step 6: Final answer
    x = 176.13

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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.