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Finding the Fourth Proportional to 988.79, 1,481.13 and 715.41

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Solution

The fourth proportional to 988.79, 1,481.13 and 715.41 is: 1,071.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.79 : 1,481.13 = 715.41 : x
  2. Step 2: Convert to fraction form
    988.79/1,481.13 = 715.41/x
  3. Step 3: Cross multiply
    988.79x = 1,481.13 × 715.41
  4. Step 4: Simplify right side
    988.79x = 1,059,615.21
  5. Step 5: Solve for x
    x = 1,059,615.21/988.79
  6. Step 6: Final answer
    x = 1,071.63

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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.