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Finding the Fourth Proportional to 818.34, 1,129.30 and 445.32

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Solution

The fourth proportional to 818.34, 1,129.30 and 445.32 is: 614.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.34 : 1,129.30 = 445.32 : x
  2. Step 2: Convert to fraction form
    818.34/1,129.30 = 445.32/x
  3. Step 3: Cross multiply
    818.34x = 1,129.30 × 445.32
  4. Step 4: Simplify right side
    818.34x = 502,899.88
  5. Step 5: Solve for x
    x = 502,899.88/818.34
  6. Step 6: Final answer
    x = 614.54

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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.