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Finding the Fourth Proportional to 983.16, 1,356.72 and 579.38

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Solution

The fourth proportional to 983.16, 1,356.72 and 579.38 is: 799.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.16 : 1,356.72 = 579.38 : x
  2. Step 2: Convert to fraction form
    983.16/1,356.72 = 579.38/x
  3. Step 3: Cross multiply
    983.16x = 1,356.72 × 579.38
  4. Step 4: Simplify right side
    983.16x = 786,059.83
  5. Step 5: Solve for x
    x = 786,059.83/983.16
  6. Step 6: Final answer
    x = 799.52

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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.