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Finding the Fourth Proportional to 1,189.15, 1,640.79 and 747.63

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Solution

The fourth proportional to 1,189.15, 1,640.79 and 747.63 is: 1,031.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.15 : 1,640.79 = 747.63 : x
  2. Step 2: Convert to fraction form
    1,189.15/1,640.79 = 747.63/x
  3. Step 3: Cross multiply
    1,189.15x = 1,640.79 × 747.63
  4. Step 4: Simplify right side
    1,189.15x = 1,226,703.83
  5. Step 5: Solve for x
    x = 1,226,703.83/1,189.15
  6. Step 6: Final answer
    x = 1,031.58

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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.