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Finding the Fourth Proportional to 389.13, 583.80 and 115.23

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Solution

The fourth proportional to 389.13, 583.80 and 115.23 is: 172.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.13 : 583.80 = 115.23 : x
  2. Step 2: Convert to fraction form
    389.13/583.80 = 115.23/x
  3. Step 3: Cross multiply
    389.13x = 583.80 × 115.23
  4. Step 4: Simplify right side
    389.13x = 67,271.27
  5. Step 5: Solve for x
    x = 67,271.27/389.13
  6. Step 6: Final answer
    x = 172.88

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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.