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Finding the Fourth Proportional to 409.42, 612.71 and 392.41

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Solution

The fourth proportional to 409.42, 612.71 and 392.41 is: 587.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.42 : 612.71 = 392.41 : x
  2. Step 2: Convert to fraction form
    409.42/612.71 = 392.41/x
  3. Step 3: Cross multiply
    409.42x = 612.71 × 392.41
  4. Step 4: Simplify right side
    409.42x = 240,428.51
  5. Step 5: Solve for x
    x = 240,428.51/409.42
  6. Step 6: Final answer
    x = 587.25

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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.