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Finding the Fourth Proportional to 1,267.18, 1,901.68 and 720.43

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Solution

The fourth proportional to 1,267.18, 1,901.68 and 720.43 is: 1,081.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.18 : 1,901.68 = 720.43 : x
  2. Step 2: Convert to fraction form
    1,267.18/1,901.68 = 720.43/x
  3. Step 3: Cross multiply
    1,267.18x = 1,901.68 × 720.43
  4. Step 4: Simplify right side
    1,267.18x = 1,370,020.77
  5. Step 5: Solve for x
    x = 1,370,020.77/1,267.18
  6. Step 6: Final answer
    x = 1,081.16

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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.