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Finding the Fourth Proportional to 405.43, 562.12 and 391.93

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Solution

The fourth proportional to 405.43, 562.12 and 391.93 is: 543.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.43 : 562.12 = 391.93 : x
  2. Step 2: Convert to fraction form
    405.43/562.12 = 391.93/x
  3. Step 3: Cross multiply
    405.43x = 562.12 × 391.93
  4. Step 4: Simplify right side
    405.43x = 220,311.69
  5. Step 5: Solve for x
    x = 220,311.69/405.43
  6. Step 6: Final answer
    x = 543.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.