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Finding the Fourth Proportional to 817.05, 1,225.60 and 672.47

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Solution

The fourth proportional to 817.05, 1,225.60 and 672.47 is: 1,008.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.05 : 1,225.60 = 672.47 : x
  2. Step 2: Convert to fraction form
    817.05/1,225.60 = 672.47/x
  3. Step 3: Cross multiply
    817.05x = 1,225.60 × 672.47
  4. Step 4: Simplify right side
    817.05x = 824,176.02
  5. Step 5: Solve for x
    x = 824,176.02/817.05
  6. Step 6: Final answer
    x = 1,008.72

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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.