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Finding the Fourth Proportional to 948.43, 1,308.79 and 528.83

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Solution

The fourth proportional to 948.43, 1,308.79 and 528.83 is: 729.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.43 : 1,308.79 = 528.83 : x
  2. Step 2: Convert to fraction form
    948.43/1,308.79 = 528.83/x
  3. Step 3: Cross multiply
    948.43x = 1,308.79 × 528.83
  4. Step 4: Simplify right side
    948.43x = 692,119.55
  5. Step 5: Solve for x
    x = 692,119.55/948.43
  6. Step 6: Final answer
    x = 729.75

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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.