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Finding the Fourth Proportional to 818.89, 1,130.09 and 445.89

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Solution

The fourth proportional to 818.89, 1,130.09 and 445.89 is: 615.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.89 : 1,130.09 = 445.89 : x
  2. Step 2: Convert to fraction form
    818.89/1,130.09 = 445.89/x
  3. Step 3: Cross multiply
    818.89x = 1,130.09 × 445.89
  4. Step 4: Simplify right side
    818.89x = 503,893.60
  5. Step 5: Solve for x
    x = 503,893.60/818.89
  6. Step 6: Final answer
    x = 615.34

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Double scale
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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.