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Finding the Fourth Proportional to 1,121.10, 1,679.74 and 730.51

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Solution

The fourth proportional to 1,121.10, 1,679.74 and 730.51 is: 1,094.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.10 : 1,679.74 = 730.51 : x
  2. Step 2: Convert to fraction form
    1,121.10/1,679.74 = 730.51/x
  3. Step 3: Cross multiply
    1,121.10x = 1,679.74 × 730.51
  4. Step 4: Simplify right side
    1,121.10x = 1,227,066.87
  5. Step 5: Solve for x
    x = 1,227,066.87/1,121.10
  6. Step 6: Final answer
    x = 1,094.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.