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Finding the Fourth Proportional to 611.63, 844.31 and 390.53

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Solution

The fourth proportional to 611.63, 844.31 and 390.53 is: 539.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.63 : 844.31 = 390.53 : x
  2. Step 2: Convert to fraction form
    611.63/844.31 = 390.53/x
  3. Step 3: Cross multiply
    611.63x = 844.31 × 390.53
  4. Step 4: Simplify right side
    611.63x = 329,731.47
  5. Step 5: Solve for x
    x = 329,731.47/611.63
  6. Step 6: Final answer
    x = 539.10

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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.