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Finding the Fourth Proportional to 983.40, 1,356.53 and 717.50

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Solution

The fourth proportional to 983.40, 1,356.53 and 717.50 is: 989.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.40 : 1,356.53 = 717.50 : x
  2. Step 2: Convert to fraction form
    983.40/1,356.53 = 717.50/x
  3. Step 3: Cross multiply
    983.40x = 1,356.53 × 717.50
  4. Step 4: Simplify right side
    983.40x = 973,299.90
  5. Step 5: Solve for x
    x = 973,299.90/983.40
  6. Step 6: Final answer
    x = 989.73

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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.