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Finding the Fourth Proportional to 750.48, 1,032.39 and 720.51

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Solution

The fourth proportional to 750.48, 1,032.39 and 720.51 is: 991.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.48 : 1,032.39 = 720.51 : x
  2. Step 2: Convert to fraction form
    750.48/1,032.39 = 720.51/x
  3. Step 3: Cross multiply
    750.48x = 1,032.39 × 720.51
  4. Step 4: Simplify right side
    750.48x = 743,847.32
  5. Step 5: Solve for x
    x = 743,847.32/750.48
  6. Step 6: Final answer
    x = 991.16

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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.