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Finding the Fourth Proportional to 259.55, 389.33 and 67.18

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Solution

The fourth proportional to 259.55, 389.33 and 67.18 is: 100.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.55 : 389.33 = 67.18 : x
  2. Step 2: Convert to fraction form
    259.55/389.33 = 67.18/x
  3. Step 3: Cross multiply
    259.55x = 389.33 × 67.18
  4. Step 4: Simplify right side
    259.55x = 26,155.19
  5. Step 5: Solve for x
    x = 26,155.19/259.55
  6. Step 6: Final answer
    x = 100.77

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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.