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Finding the Fourth Proportional to 988.62, 1,481.51 and 726.57

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Solution

The fourth proportional to 988.62, 1,481.51 and 726.57 is: 1,088.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.62 : 1,481.51 = 726.57 : x
  2. Step 2: Convert to fraction form
    988.62/1,481.51 = 726.57/x
  3. Step 3: Cross multiply
    988.62x = 1,481.51 × 726.57
  4. Step 4: Simplify right side
    988.62x = 1,076,420.72
  5. Step 5: Solve for x
    x = 1,076,420.72/988.62
  6. Step 6: Final answer
    x = 1,088.81

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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.