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Finding the Fourth Proportional to 2,135.64, 2,945.28 and 1,388.88

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Solution

The fourth proportional to 2,135.64, 2,945.28 and 1,388.88 is: 1,915.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.64 : 2,945.28 = 1,388.88 : x
  2. Step 2: Convert to fraction form
    2,135.64/2,945.28 = 1,388.88/x
  3. Step 3: Cross multiply
    2,135.64x = 2,945.28 × 1,388.88
  4. Step 4: Simplify right side
    2,135.64x = 4,090,640.49
  5. Step 5: Solve for x
    x = 4,090,640.49/2,135.64
  6. Step 6: Final answer
    x = 1,915.42

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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.