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Finding the Fourth Proportional to 818.45, 1,126.63 and 712.04

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Solution

The fourth proportional to 818.45, 1,126.63 and 712.04 is: 980.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.45 : 1,126.63 = 712.04 : x
  2. Step 2: Convert to fraction form
    818.45/1,126.63 = 712.04/x
  3. Step 3: Cross multiply
    818.45x = 1,126.63 × 712.04
  4. Step 4: Simplify right side
    818.45x = 802,209.22
  5. Step 5: Solve for x
    x = 802,209.22/818.45
  6. Step 6: Final answer
    x = 980.15

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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.