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Finding the Fourth Proportional to 818.51, 1,128.94 and 609.39

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Solution

The fourth proportional to 818.51, 1,128.94 and 609.39 is: 840.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.51 : 1,128.94 = 609.39 : x
  2. Step 2: Convert to fraction form
    818.51/1,128.94 = 609.39/x
  3. Step 3: Cross multiply
    818.51x = 1,128.94 × 609.39
  4. Step 4: Simplify right side
    818.51x = 687,963.22
  5. Step 5: Solve for x
    x = 687,963.22/818.51
  6. Step 6: Final answer
    x = 840.51

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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.