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Finding the Fourth Proportional to 983.81, 1,356.90 and 688.97

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Solution

The fourth proportional to 983.81, 1,356.90 and 688.97 is: 950.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.81 : 1,356.90 = 688.97 : x
  2. Step 2: Convert to fraction form
    983.81/1,356.90 = 688.97/x
  3. Step 3: Cross multiply
    983.81x = 1,356.90 × 688.97
  4. Step 4: Simplify right side
    983.81x = 934,863.39
  5. Step 5: Solve for x
    x = 934,863.39/983.81
  6. Step 6: Final answer
    x = 950.25

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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.