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Finding the Fourth Proportional to 988.11, 1,366.19 and 972.51

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Solution

The fourth proportional to 988.11, 1,366.19 and 972.51 is: 1,344.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.11 : 1,366.19 = 972.51 : x
  2. Step 2: Convert to fraction form
    988.11/1,366.19 = 972.51/x
  3. Step 3: Cross multiply
    988.11x = 1,366.19 × 972.51
  4. Step 4: Simplify right side
    988.11x = 1,328,628.57
  5. Step 5: Solve for x
    x = 1,328,628.57/988.11
  6. Step 6: Final answer
    x = 1,344.62

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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.