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Finding the Fourth Proportional to 389.36, 586.70 and 322.38

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Solution

The fourth proportional to 389.36, 586.70 and 322.38 is: 485.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.36 : 586.70 = 322.38 : x
  2. Step 2: Convert to fraction form
    389.36/586.70 = 322.38/x
  3. Step 3: Cross multiply
    389.36x = 586.70 × 322.38
  4. Step 4: Simplify right side
    389.36x = 189,140.35
  5. Step 5: Solve for x
    x = 189,140.35/389.36
  6. Step 6: Final answer
    x = 485.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.