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Finding the Fourth Proportional to 818.72, 1,128.84 and 713.42

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Solution

The fourth proportional to 818.72, 1,128.84 and 713.42 is: 983.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.72 : 1,128.84 = 713.42 : x
  2. Step 2: Convert to fraction form
    818.72/1,128.84 = 713.42/x
  3. Step 3: Cross multiply
    818.72x = 1,128.84 × 713.42
  4. Step 4: Simplify right side
    818.72x = 805,337.03
  5. Step 5: Solve for x
    x = 805,337.03/818.72
  6. Step 6: Final answer
    x = 983.65

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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.