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Finding the Fourth Proportional to 853.64, 1,279 and 528.32

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Solution

The fourth proportional to 853.64, 1,279 and 528.32 is: 791.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.64 : 1,279 = 528.32 : x
  2. Step 2: Convert to fraction form
    853.64/1,279 = 528.32/x
  3. Step 3: Cross multiply
    853.64x = 1,279 × 528.32
  4. Step 4: Simplify right side
    853.64x = 675,721.28
  5. Step 5: Solve for x
    x = 675,721.28/853.64
  6. Step 6: Final answer
    x = 791.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.