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Finding the Fourth Proportional to 931.80, 1,285.68 and 538.80

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Solution

The fourth proportional to 931.80, 1,285.68 and 538.80 is: 743.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.80 : 1,285.68 = 538.80 : x
  2. Step 2: Convert to fraction form
    931.80/1,285.68 = 538.80/x
  3. Step 3: Cross multiply
    931.80x = 1,285.68 × 538.80
  4. Step 4: Simplify right side
    931.80x = 692,724.38
  5. Step 5: Solve for x
    x = 692,724.38/931.80
  6. Step 6: Final answer
    x = 743.43

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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.