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Finding the Fourth Proportional to 818.36, 1,128.14 and 621.53

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Solution

The fourth proportional to 818.36, 1,128.14 and 621.53 is: 856.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.36 : 1,128.14 = 621.53 : x
  2. Step 2: Convert to fraction form
    818.36/1,128.14 = 621.53/x
  3. Step 3: Cross multiply
    818.36x = 1,128.14 × 621.53
  4. Step 4: Simplify right side
    818.36x = 701,174.16
  5. Step 5: Solve for x
    x = 701,174.16/818.36
  6. Step 6: Final answer
    x = 856.81

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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.