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Finding the Fourth Proportional to 389.91, 581.15 and 368.02

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Solution

The fourth proportional to 389.91, 581.15 and 368.02 is: 548.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.91 : 581.15 = 368.02 : x
  2. Step 2: Convert to fraction form
    389.91/581.15 = 368.02/x
  3. Step 3: Cross multiply
    389.91x = 581.15 × 368.02
  4. Step 4: Simplify right side
    389.91x = 213,876.47
  5. Step 5: Solve for x
    x = 213,876.47/389.91
  6. Step 6: Final answer
    x = 548.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.