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Finding the Fourth Proportional to 720.03, 1,079.40 and 426.81

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Solution

The fourth proportional to 720.03, 1,079.40 and 426.81 is: 639.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.03 : 1,079.40 = 426.81 : x
  2. Step 2: Convert to fraction form
    720.03/1,079.40 = 426.81/x
  3. Step 3: Cross multiply
    720.03x = 1,079.40 × 426.81
  4. Step 4: Simplify right side
    720.03x = 460,698.71
  5. Step 5: Solve for x
    x = 460,698.71/720.03
  6. Step 6: Final answer
    x = 639.83

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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.