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Finding the Fourth Proportional to 817.88, 1,225.65 and 720.14

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Solution

The fourth proportional to 817.88, 1,225.65 and 720.14 is: 1,079.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.88 : 1,225.65 = 720.14 : x
  2. Step 2: Convert to fraction form
    817.88/1,225.65 = 720.14/x
  3. Step 3: Cross multiply
    817.88x = 1,225.65 × 720.14
  4. Step 4: Simplify right side
    817.88x = 882,639.59
  5. Step 5: Solve for x
    x = 882,639.59/817.88
  6. Step 6: Final answer
    x = 1,079.18

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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.