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Finding the Fourth Proportional to 407.11, 561.78 and 230.08

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Solution

The fourth proportional to 407.11, 561.78 and 230.08 is: 317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.11 : 561.78 = 230.08 : x
  2. Step 2: Convert to fraction form
    407.11/561.78 = 230.08/x
  3. Step 3: Cross multiply
    407.11x = 561.78 × 230.08
  4. Step 4: Simplify right side
    407.11x = 129,254.34
  5. Step 5: Solve for x
    x = 129,254.34/407.11
  6. Step 6: Final answer
    x = 317.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.