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Finding the Fourth Proportional to 612.68, 845.07 and 391.52

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Solution

The fourth proportional to 612.68, 845.07 and 391.52 is: 540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.68 : 845.07 = 391.52 : x
  2. Step 2: Convert to fraction form
    612.68/845.07 = 391.52/x
  3. Step 3: Cross multiply
    612.68x = 845.07 × 391.52
  4. Step 4: Simplify right side
    612.68x = 330,861.81
  5. Step 5: Solve for x
    x = 330,861.81/612.68
  6. Step 6: Final answer
    x = 540.03

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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.