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Finding the Fourth Proportional to 389.93, 583.90 and 216.40

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Solution

The fourth proportional to 389.93, 583.90 and 216.40 is: 324.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.93 : 583.90 = 216.40 : x
  2. Step 2: Convert to fraction form
    389.93/583.90 = 216.40/x
  3. Step 3: Cross multiply
    389.93x = 583.90 × 216.40
  4. Step 4: Simplify right side
    389.93x = 126,355.96
  5. Step 5: Solve for x
    x = 126,355.96/389.93
  6. Step 6: Final answer
    x = 324.05

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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.