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Finding the Fourth Proportional to 412.16, 621.26 and 386.72

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Solution

The fourth proportional to 412.16, 621.26 and 386.72 is: 582.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.16 : 621.26 = 386.72 : x
  2. Step 2: Convert to fraction form
    412.16/621.26 = 386.72/x
  3. Step 3: Cross multiply
    412.16x = 621.26 × 386.72
  4. Step 4: Simplify right side
    412.16x = 240,253.67
  5. Step 5: Solve for x
    x = 240,253.67/412.16
  6. Step 6: Final answer
    x = 582.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.