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Finding the Fourth Proportional to 1,394.64, 2,091.76 and 528.75

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Solution

The fourth proportional to 1,394.64, 2,091.76 and 528.75 is: 793.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.64 : 2,091.76 = 528.75 : x
  2. Step 2: Convert to fraction form
    1,394.64/2,091.76 = 528.75/x
  3. Step 3: Cross multiply
    1,394.64x = 2,091.76 × 528.75
  4. Step 4: Simplify right side
    1,394.64x = 1,106,016.78
  5. Step 5: Solve for x
    x = 1,106,016.78/1,394.64
  6. Step 6: Final answer
    x = 793.05

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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.