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Finding the Fourth Proportional to 611.86, 844.38 and 390.76

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Solution

The fourth proportional to 611.86, 844.38 and 390.76 is: 539.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.86 : 844.38 = 390.76 : x
  2. Step 2: Convert to fraction form
    611.86/844.38 = 390.76/x
  3. Step 3: Cross multiply
    611.86x = 844.38 × 390.76
  4. Step 4: Simplify right side
    611.86x = 329,949.93
  5. Step 5: Solve for x
    x = 329,949.93/611.86
  6. Step 6: Final answer
    x = 539.26

Related Problems

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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.