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Finding the Fourth Proportional to 1,270.80, 1,903.68 and 722.16

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Solution

The fourth proportional to 1,270.80, 1,903.68 and 722.16 is: 1,081.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.80 : 1,903.68 = 722.16 : x
  2. Step 2: Convert to fraction form
    1,270.80/1,903.68 = 722.16/x
  3. Step 3: Cross multiply
    1,270.80x = 1,903.68 × 722.16
  4. Step 4: Simplify right side
    1,270.80x = 1,374,761.55
  5. Step 5: Solve for x
    x = 1,374,761.55/1,270.80
  6. Step 6: Final answer
    x = 1,081.81

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1.5x scale

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.