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Finding the Fourth Proportional to 948.38, 1,308.72 and 528.70

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Solution

The fourth proportional to 948.38, 1,308.72 and 528.70 is: 729.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.38 : 1,308.72 = 528.70 : x
  2. Step 2: Convert to fraction form
    948.38/1,308.72 = 528.70/x
  3. Step 3: Cross multiply
    948.38x = 1,308.72 × 528.70
  4. Step 4: Simplify right side
    948.38x = 691,920.26
  5. Step 5: Solve for x
    x = 691,920.26/948.38
  6. Step 6: Final answer
    x = 729.58

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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.