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Finding the Fourth Proportional to 816.84, 1,127.17 and 485.34

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Solution

The fourth proportional to 816.84, 1,127.17 and 485.34 is: 669.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.84 : 1,127.17 = 485.34 : x
  2. Step 2: Convert to fraction form
    816.84/1,127.17 = 485.34/x
  3. Step 3: Cross multiply
    816.84x = 1,127.17 × 485.34
  4. Step 4: Simplify right side
    816.84x = 547,060.69
  5. Step 5: Solve for x
    x = 547,060.69/816.84
  6. Step 6: Final answer
    x = 669.73

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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.