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Finding the Fourth Proportional to 750.97, 1,126.59 and 643.51

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Solution

The fourth proportional to 750.97, 1,126.59 and 643.51 is: 965.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.97 : 1,126.59 = 643.51 : x
  2. Step 2: Convert to fraction form
    750.97/1,126.59 = 643.51/x
  3. Step 3: Cross multiply
    750.97x = 1,126.59 × 643.51
  4. Step 4: Simplify right side
    750.97x = 724,971.93
  5. Step 5: Solve for x
    x = 724,971.93/750.97
  6. Step 6: Final answer
    x = 965.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.