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Finding the Fourth Proportional to 818.24, 1,129.13 and 445.21

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Solution

The fourth proportional to 818.24, 1,129.13 and 445.21 is: 614.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.24 : 1,129.13 = 445.21 : x
  2. Step 2: Convert to fraction form
    818.24/1,129.13 = 445.21/x
  3. Step 3: Cross multiply
    818.24x = 1,129.13 × 445.21
  4. Step 4: Simplify right side
    818.24x = 502,699.97
  5. Step 5: Solve for x
    x = 502,699.97/818.24
  6. Step 6: Final answer
    x = 614.37

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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.