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Finding the Fourth Proportional to 1,216.88, 1,679.60 and 719.94

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Solution

The fourth proportional to 1,216.88, 1,679.60 and 719.94 is: 993.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.88 : 1,679.60 = 719.94 : x
  2. Step 2: Convert to fraction form
    1,216.88/1,679.60 = 719.94/x
  3. Step 3: Cross multiply
    1,216.88x = 1,679.60 × 719.94
  4. Step 4: Simplify right side
    1,216.88x = 1,209,211.22
  5. Step 5: Solve for x
    x = 1,209,211.22/1,216.88
  6. Step 6: Final answer
    x = 993.70

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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.