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Finding the Fourth Proportional to 905.92, 1,248.96 and 720.03

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Solution

The fourth proportional to 905.92, 1,248.96 and 720.03 is: 992.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.92 : 1,248.96 = 720.03 : x
  2. Step 2: Convert to fraction form
    905.92/1,248.96 = 720.03/x
  3. Step 3: Cross multiply
    905.92x = 1,248.96 × 720.03
  4. Step 4: Simplify right side
    905.92x = 899,288.67
  5. Step 5: Solve for x
    x = 899,288.67/905.92
  6. Step 6: Final answer
    x = 992.68

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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.