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Finding the Fourth Proportional to 1,269.84, 1,903.36 and 720.84

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Solution

The fourth proportional to 1,269.84, 1,903.36 and 720.84 is: 1,080.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.84 : 1,903.36 = 720.84 : x
  2. Step 2: Convert to fraction form
    1,269.84/1,903.36 = 720.84/x
  3. Step 3: Cross multiply
    1,269.84x = 1,903.36 × 720.84
  4. Step 4: Simplify right side
    1,269.84x = 1,372,018.02
  5. Step 5: Solve for x
    x = 1,372,018.02/1,269.84
  6. Step 6: Final answer
    x = 1,080.47

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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.