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Finding the Fourth Proportional to 818.77, 1,129.92 and 445.77

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Solution

The fourth proportional to 818.77, 1,129.92 and 445.77 is: 615.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.77 : 1,129.92 = 445.77 : x
  2. Step 2: Convert to fraction form
    818.77/1,129.92 = 445.77/x
  3. Step 3: Cross multiply
    818.77x = 1,129.92 × 445.77
  4. Step 4: Simplify right side
    818.77x = 503,684.44
  5. Step 5: Solve for x
    x = 503,684.44/818.77
  6. Step 6: Final answer
    x = 615.17

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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.