Home / 1,528.25-2,108.99-938.78

Finding the Fourth Proportional to 1,528.25, 2,108.99 and 938.78

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Solution

The fourth proportional to 1,528.25, 2,108.99 and 938.78 is: 1,295.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.25 : 2,108.99 = 938.78 : x
  2. Step 2: Convert to fraction form
    1,528.25/2,108.99 = 938.78/x
  3. Step 3: Cross multiply
    1,528.25x = 2,108.99 × 938.78
  4. Step 4: Simplify right side
    1,528.25x = 1,979,877.63
  5. Step 5: Solve for x
    x = 1,979,877.63/1,528.25
  6. Step 6: Final answer
    x = 1,295.52

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Double scale
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1.5x scale

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.