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Finding the Fourth Proportional to 988.41, 1,479.13 and 727.80

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Solution

The fourth proportional to 988.41, 1,479.13 and 727.80 is: 1,089.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.41 : 1,479.13 = 727.80 : x
  2. Step 2: Convert to fraction form
    988.41/1,479.13 = 727.80/x
  3. Step 3: Cross multiply
    988.41x = 1,479.13 × 727.80
  4. Step 4: Simplify right side
    988.41x = 1,076,503.45
  5. Step 5: Solve for x
    x = 1,076,503.45/988.41
  6. Step 6: Final answer
    x = 1,089.12

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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.