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Finding the Fourth Proportional to 948.36, 1,308.74 and 528.74

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Solution

The fourth proportional to 948.36, 1,308.74 and 528.74 is: 729.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.36 : 1,308.74 = 528.74 : x
  2. Step 2: Convert to fraction form
    948.36/1,308.74 = 528.74/x
  3. Step 3: Cross multiply
    948.36x = 1,308.74 × 528.74
  4. Step 4: Simplify right side
    948.36x = 691,979.92
  5. Step 5: Solve for x
    x = 691,979.92/948.36
  6. Step 6: Final answer
    x = 729.66

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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.