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Finding the Fourth Proportional to 985.67, 1,360.21 and 537.55

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Solution

The fourth proportional to 985.67, 1,360.21 and 537.55 is: 741.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.67 : 1,360.21 = 537.55 : x
  2. Step 2: Convert to fraction form
    985.67/1,360.21 = 537.55/x
  3. Step 3: Cross multiply
    985.67x = 1,360.21 × 537.55
  4. Step 4: Simplify right side
    985.67x = 731,171.40
  5. Step 5: Solve for x
    x = 731,171.40/985.67
  6. Step 6: Final answer
    x = 741.80

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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.