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Finding the Fourth Proportional to 259.76, 390.36 and 259.04

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Solution

The fourth proportional to 259.76, 390.36 and 259.04 is: 389.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.76 : 390.36 = 259.04 : x
  2. Step 2: Convert to fraction form
    259.76/390.36 = 259.04/x
  3. Step 3: Cross multiply
    259.76x = 390.36 × 259.04
  4. Step 4: Simplify right side
    259.76x = 101,118.85
  5. Step 5: Solve for x
    x = 101,118.85/259.76
  6. Step 6: Final answer
    x = 389.28

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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.