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Finding the Fourth Proportional to 985.55, 1,360.60 and 719.72

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Solution

The fourth proportional to 985.55, 1,360.60 and 719.72 is: 993.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.55 : 1,360.60 = 719.72 : x
  2. Step 2: Convert to fraction form
    985.55/1,360.60 = 719.72/x
  3. Step 3: Cross multiply
    985.55x = 1,360.60 × 719.72
  4. Step 4: Simplify right side
    985.55x = 979,247.43
  5. Step 5: Solve for x
    x = 979,247.43/985.55
  6. Step 6: Final answer
    x = 993.61

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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.