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Finding the Fourth Proportional to 407.66, 561.20 and 309.24

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Solution

The fourth proportional to 407.66, 561.20 and 309.24 is: 425.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.66 : 561.20 = 309.24 : x
  2. Step 2: Convert to fraction form
    407.66/561.20 = 309.24/x
  3. Step 3: Cross multiply
    407.66x = 561.20 × 309.24
  4. Step 4: Simplify right side
    407.66x = 173,543.94
  5. Step 5: Solve for x
    x = 173,543.94/407.66
  6. Step 6: Final answer
    x = 425.71

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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.