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Finding the Fourth Proportional to 817, 1,127.19 and 485.53

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Solution

The fourth proportional to 817, 1,127.19 and 485.53 is: 669.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    817 : 1,127.19 = 485.53 : x
  2. Step 2: Convert to fraction form
    817/1,127.19 = 485.53/x
  3. Step 3: Cross multiply
    817x = 1,127.19 × 485.53
  4. Step 4: Simplify right side
    817x = 547,284.56
  5. Step 5: Solve for x
    x = 547,284.56/817
  6. Step 6: Final answer
    x = 669.87

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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.