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Finding the Fourth Proportional to 259.88, 389.81 and 67.50

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Solution

The fourth proportional to 259.88, 389.81 and 67.50 is: 101.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.88 : 389.81 = 67.50 : x
  2. Step 2: Convert to fraction form
    259.88/389.81 = 67.50/x
  3. Step 3: Cross multiply
    259.88x = 389.81 × 67.50
  4. Step 4: Simplify right side
    259.88x = 26,312.34
  5. Step 5: Solve for x
    x = 26,312.34/259.88
  6. Step 6: Final answer
    x = 101.25

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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.