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Finding the Fourth Proportional to 818.10, 1,129.41 and 712.40

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Solution

The fourth proportional to 818.10, 1,129.41 and 712.40 is: 983.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.10 : 1,129.41 = 712.40 : x
  2. Step 2: Convert to fraction form
    818.10/1,129.41 = 712.40/x
  3. Step 3: Cross multiply
    818.10x = 1,129.41 × 712.40
  4. Step 4: Simplify right side
    818.10x = 804,586.04
  5. Step 5: Solve for x
    x = 804,586.04/818.10
  6. Step 6: Final answer
    x = 983.48

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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.