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Finding the Fourth Proportional to 612.51, 845.15 and 391.29

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Solution

The fourth proportional to 612.51, 845.15 and 391.29 is: 539.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.51 : 845.15 = 391.29 : x
  2. Step 2: Convert to fraction form
    612.51/845.15 = 391.29/x
  3. Step 3: Cross multiply
    612.51x = 845.15 × 391.29
  4. Step 4: Simplify right side
    612.51x = 330,696.79
  5. Step 5: Solve for x
    x = 330,696.79/612.51
  6. Step 6: Final answer
    x = 539.90

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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.