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Finding the Fourth Proportional to 818.61, 1,129.69 and 445.60

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Solution

The fourth proportional to 818.61, 1,129.69 and 445.60 is: 614.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.61 : 1,129.69 = 445.60 : x
  2. Step 2: Convert to fraction form
    818.61/1,129.69 = 445.60/x
  3. Step 3: Cross multiply
    818.61x = 1,129.69 × 445.60
  4. Step 4: Simplify right side
    818.61x = 503,389.86
  5. Step 5: Solve for x
    x = 503,389.86/818.61
  6. Step 6: Final answer
    x = 614.93

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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.