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Finding the Fourth Proportional to 983.38, 1,355.82 and 720.94

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Solution

The fourth proportional to 983.38, 1,355.82 and 720.94 is: 993.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.38 : 1,355.82 = 720.94 : x
  2. Step 2: Convert to fraction form
    983.38/1,355.82 = 720.94/x
  3. Step 3: Cross multiply
    983.38x = 1,355.82 × 720.94
  4. Step 4: Simplify right side
    983.38x = 977,464.87
  5. Step 5: Solve for x
    x = 977,464.87/983.38
  6. Step 6: Final answer
    x = 993.98

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1.5x scale

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.