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Finding the Fourth Proportional to 948.40, 1,308.78 and 528.69

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Solution

The fourth proportional to 948.40, 1,308.78 and 528.69 is: 729.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.40 : 1,308.78 = 528.69 : x
  2. Step 2: Convert to fraction form
    948.40/1,308.78 = 528.69/x
  3. Step 3: Cross multiply
    948.40x = 1,308.78 × 528.69
  4. Step 4: Simplify right side
    948.40x = 691,939.77
  5. Step 5: Solve for x
    x = 691,939.77/948.40
  6. Step 6: Final answer
    x = 729.59

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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.