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Finding the Fourth Proportional to 2,667.79, 4,001.69 and 720.00

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Solution

The fourth proportional to 2,667.79, 4,001.69 and 720.00 is: 1,079.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,667.79 : 4,001.69 = 720.00 : x
  2. Step 2: Convert to fraction form
    2,667.79/4,001.69 = 720.00/x
  3. Step 3: Cross multiply
    2,667.79x = 4,001.69 × 720.00
  4. Step 4: Simplify right side
    2,667.79x = 2,881,194.99
  5. Step 5: Solve for x
    x = 2,881,194.99/2,667.79
  6. Step 6: Final answer
    x = 1,079.99

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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.