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Finding the Fourth Proportional to 926.81, 1,279.04 and 528.39

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Solution

The fourth proportional to 926.81, 1,279.04 and 528.39 is: 729.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.81 : 1,279.04 = 528.39 : x
  2. Step 2: Convert to fraction form
    926.81/1,279.04 = 528.39/x
  3. Step 3: Cross multiply
    926.81x = 1,279.04 × 528.39
  4. Step 4: Simplify right side
    926.81x = 675,829.30
  5. Step 5: Solve for x
    x = 675,829.30/926.81
  6. Step 6: Final answer
    x = 729.20

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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.