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Finding the Fourth Proportional to 389.97, 584.31 and 312.51

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Solution

The fourth proportional to 389.97, 584.31 and 312.51 is: 468.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.97 : 584.31 = 312.51 : x
  2. Step 2: Convert to fraction form
    389.97/584.31 = 312.51/x
  3. Step 3: Cross multiply
    389.97x = 584.31 × 312.51
  4. Step 4: Simplify right side
    389.97x = 182,602.72
  5. Step 5: Solve for x
    x = 182,602.72/389.97
  6. Step 6: Final answer
    x = 468.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.