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Finding the Fourth Proportional to 745.29, 1,028.90 and 496.98

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Solution

The fourth proportional to 745.29, 1,028.90 and 496.98 is: 686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.29 : 1,028.90 = 496.98 : x
  2. Step 2: Convert to fraction form
    745.29/1,028.90 = 496.98/x
  3. Step 3: Cross multiply
    745.29x = 1,028.90 × 496.98
  4. Step 4: Simplify right side
    745.29x = 511,343.96
  5. Step 5: Solve for x
    x = 511,343.96/745.29
  6. Step 6: Final answer
    x = 686.10

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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.