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Finding the Fourth Proportional to 988.71, 1,366.20 and 708.48

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Solution

The fourth proportional to 988.71, 1,366.20 and 708.48 is: 978.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.71 : 1,366.20 = 708.48 : x
  2. Step 2: Convert to fraction form
    988.71/1,366.20 = 708.48/x
  3. Step 3: Cross multiply
    988.71x = 1,366.20 × 708.48
  4. Step 4: Simplify right side
    988.71x = 967,925.38
  5. Step 5: Solve for x
    x = 967,925.38/988.71
  6. Step 6: Final answer
    x = 978.98

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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.