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Finding the Fourth Proportional to 818.47, 1,129.49 and 445.45

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Solution

The fourth proportional to 818.47, 1,129.49 and 445.45 is: 614.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.47 : 1,129.49 = 445.45 : x
  2. Step 2: Convert to fraction form
    818.47/1,129.49 = 445.45/x
  3. Step 3: Cross multiply
    818.47x = 1,129.49 × 445.45
  4. Step 4: Simplify right side
    818.47x = 503,126.27
  5. Step 5: Solve for x
    x = 503,126.27/818.47
  6. Step 6: Final answer
    x = 614.72

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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.