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Finding the Fourth Proportional to 744.65, 1,027.64 and 557.81

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Solution

The fourth proportional to 744.65, 1,027.64 and 557.81 is: 769.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.65 : 1,027.64 = 557.81 : x
  2. Step 2: Convert to fraction form
    744.65/1,027.64 = 557.81/x
  3. Step 3: Cross multiply
    744.65x = 1,027.64 × 557.81
  4. Step 4: Simplify right side
    744.65x = 573,219.94
  5. Step 5: Solve for x
    x = 573,219.94/744.65
  6. Step 6: Final answer
    x = 769.79

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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.