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Finding the Fourth Proportional to 2,128.40, 3,188.75 and 893.59

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Solution

The fourth proportional to 2,128.40, 3,188.75 and 893.59 is: 1,338.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.40 : 3,188.75 = 893.59 : x
  2. Step 2: Convert to fraction form
    2,128.40/3,188.75 = 893.59/x
  3. Step 3: Cross multiply
    2,128.40x = 3,188.75 × 893.59
  4. Step 4: Simplify right side
    2,128.40x = 2,849,448.24
  5. Step 5: Solve for x
    x = 2,849,448.24/2,128.40
  6. Step 6: Final answer
    x = 1,338.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.