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Finding the Fourth Proportional to 259.47, 389.25 and 74.40

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Solution

The fourth proportional to 259.47, 389.25 and 74.40 is: 111.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.47 : 389.25 = 74.40 : x
  2. Step 2: Convert to fraction form
    259.47/389.25 = 74.40/x
  3. Step 3: Cross multiply
    259.47x = 389.25 × 74.40
  4. Step 4: Simplify right side
    259.47x = 28,960.20
  5. Step 5: Solve for x
    x = 28,960.20/259.47
  6. Step 6: Final answer
    x = 111.61

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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.