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Finding the Fourth Proportional to 907.68, 1,249.20 and 720.54

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Solution

The fourth proportional to 907.68, 1,249.20 and 720.54 is: 991.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.68 : 1,249.20 = 720.54 : x
  2. Step 2: Convert to fraction form
    907.68/1,249.20 = 720.54/x
  3. Step 3: Cross multiply
    907.68x = 1,249.20 × 720.54
  4. Step 4: Simplify right side
    907.68x = 900,098.57
  5. Step 5: Solve for x
    x = 900,098.57/907.68
  6. Step 6: Final answer
    x = 991.65

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1.5x scale

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.