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Finding the Fourth Proportional to 412.79, 569.64 and 238.15

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Solution

The fourth proportional to 412.79, 569.64 and 238.15 is: 328.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.79 : 569.64 = 238.15 : x
  2. Step 2: Convert to fraction form
    412.79/569.64 = 238.15/x
  3. Step 3: Cross multiply
    412.79x = 569.64 × 238.15
  4. Step 4: Simplify right side
    412.79x = 135,656.92
  5. Step 5: Solve for x
    x = 135,656.92/412.79
  6. Step 6: Final answer
    x = 328.63

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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.