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Finding the Fourth Proportional to 985.82, 1,360.50 and 543.80

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Solution

The fourth proportional to 985.82, 1,360.50 and 543.80 is: 750.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.82 : 1,360.50 = 543.80 : x
  2. Step 2: Convert to fraction form
    985.82/1,360.50 = 543.80/x
  3. Step 3: Cross multiply
    985.82x = 1,360.50 × 543.80
  4. Step 4: Simplify right side
    985.82x = 739,839.90
  5. Step 5: Solve for x
    x = 739,839.90/985.82
  6. Step 6: Final answer
    x = 750.48

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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.