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Finding the Fourth Proportional to 745.92, 1,028.64 and 718.08

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Solution

The fourth proportional to 745.92, 1,028.64 and 718.08 is: 990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.92 : 1,028.64 = 718.08 : x
  2. Step 2: Convert to fraction form
    745.92/1,028.64 = 718.08/x
  3. Step 3: Cross multiply
    745.92x = 1,028.64 × 718.08
  4. Step 4: Simplify right side
    745.92x = 738,645.81
  5. Step 5: Solve for x
    x = 738,645.81/745.92
  6. Step 6: Final answer
    x = 990.25

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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.