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Finding the Fourth Proportional to 817.07, 1,127.43 and 485.43

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Solution

The fourth proportional to 817.07, 1,127.43 and 485.43 is: 669.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.07 : 1,127.43 = 485.43 : x
  2. Step 2: Convert to fraction form
    817.07/1,127.43 = 485.43/x
  3. Step 3: Cross multiply
    817.07x = 1,127.43 × 485.43
  4. Step 4: Simplify right side
    817.07x = 547,288.34
  5. Step 5: Solve for x
    x = 547,288.34/817.07
  6. Step 6: Final answer
    x = 669.82

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1.5x scale

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.