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Finding the Fourth Proportional to 679.61, 1,018.77 and 246.66

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Solution

The fourth proportional to 679.61, 1,018.77 and 246.66 is: 369.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.61 : 1,018.77 = 246.66 : x
  2. Step 2: Convert to fraction form
    679.61/1,018.77 = 246.66/x
  3. Step 3: Cross multiply
    679.61x = 1,018.77 × 246.66
  4. Step 4: Simplify right side
    679.61x = 251,289.81
  5. Step 5: Solve for x
    x = 251,289.81/679.61
  6. Step 6: Final answer
    x = 369.76

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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.