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Finding the Fourth Proportional to 1,139.93, 1,573.76 and 720.64

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Solution

The fourth proportional to 1,139.93, 1,573.76 and 720.64 is: 994.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.93 : 1,573.76 = 720.64 : x
  2. Step 2: Convert to fraction form
    1,139.93/1,573.76 = 720.64/x
  3. Step 3: Cross multiply
    1,139.93x = 1,573.76 × 720.64
  4. Step 4: Simplify right side
    1,139.93x = 1,134,112.27
  5. Step 5: Solve for x
    x = 1,134,112.27/1,139.93
  6. Step 6: Final answer
    x = 994.90

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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.