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Finding the Fourth Proportional to 810.20, 1,118.21 and 516.17

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Solution

The fourth proportional to 810.20, 1,118.21 and 516.17 is: 712.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.20 : 1,118.21 = 516.17 : x
  2. Step 2: Convert to fraction form
    810.20/1,118.21 = 516.17/x
  3. Step 3: Cross multiply
    810.20x = 1,118.21 × 516.17
  4. Step 4: Simplify right side
    810.20x = 577,186.67
  5. Step 5: Solve for x
    x = 577,186.67/810.20
  6. Step 6: Final answer
    x = 712.40

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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.