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Finding the Fourth Proportional to 745.81, 1,030.58 and 721.78

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Solution

The fourth proportional to 745.81, 1,030.58 and 721.78 is: 997.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.81 : 1,030.58 = 721.78 : x
  2. Step 2: Convert to fraction form
    745.81/1,030.58 = 721.78/x
  3. Step 3: Cross multiply
    745.81x = 1,030.58 × 721.78
  4. Step 4: Simplify right side
    745.81x = 743,852.03
  5. Step 5: Solve for x
    x = 743,852.03/745.81
  6. Step 6: Final answer
    x = 997.37

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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.