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Finding the Fourth Proportional to 818.88, 1,128.12 and 694.14

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Solution

The fourth proportional to 818.88, 1,128.12 and 694.14 is: 956.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.88 : 1,128.12 = 694.14 : x
  2. Step 2: Convert to fraction form
    818.88/1,128.12 = 694.14/x
  3. Step 3: Cross multiply
    818.88x = 1,128.12 × 694.14
  4. Step 4: Simplify right side
    818.88x = 783,073.22
  5. Step 5: Solve for x
    x = 783,073.22/818.88
  6. Step 6: Final answer
    x = 956.27

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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.