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Finding the Fourth Proportional to 612.76, 845.49 and 391.54

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Solution

The fourth proportional to 612.76, 845.49 and 391.54 is: 540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.76 : 845.49 = 391.54 : x
  2. Step 2: Convert to fraction form
    612.76/845.49 = 391.54/x
  3. Step 3: Cross multiply
    612.76x = 845.49 × 391.54
  4. Step 4: Simplify right side
    612.76x = 331,043.15
  5. Step 5: Solve for x
    x = 331,043.15/612.76
  6. Step 6: Final answer
    x = 540.25

Related Problems

Find fourth proportional to 306.38, 422.75 and 195.77
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Double scale
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1.5x scale

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.