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Finding the Fourth Proportional to 1,263.04, 1,742.76 and 739

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Solution

The fourth proportional to 1,263.04, 1,742.76 and 739 is: 1,019.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.04 : 1,742.76 = 739 : x
  2. Step 2: Convert to fraction form
    1,263.04/1,742.76 = 739/x
  3. Step 3: Cross multiply
    1,263.04x = 1,742.76 × 739
  4. Step 4: Simplify right side
    1,263.04x = 1,287,899.64
  5. Step 5: Solve for x
    x = 1,287,899.64/1,263.04
  6. Step 6: Final answer
    x = 1,019.68

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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.