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Finding the Fourth Proportional to 988.28, 1,363.55 and 708.47

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Solution

The fourth proportional to 988.28, 1,363.55 and 708.47 is: 977.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.28 : 1,363.55 = 708.47 : x
  2. Step 2: Convert to fraction form
    988.28/1,363.55 = 708.47/x
  3. Step 3: Cross multiply
    988.28x = 1,363.55 × 708.47
  4. Step 4: Simplify right side
    988.28x = 966,034.27
  5. Step 5: Solve for x
    x = 966,034.27/988.28
  6. Step 6: Final answer
    x = 977.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.