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Finding the Fourth Proportional to 1,305.66, 1,958.56 and 428.25

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Solution

The fourth proportional to 1,305.66, 1,958.56 and 428.25 is: 642.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.66 : 1,958.56 = 428.25 : x
  2. Step 2: Convert to fraction form
    1,305.66/1,958.56 = 428.25/x
  3. Step 3: Cross multiply
    1,305.66x = 1,958.56 × 428.25
  4. Step 4: Simplify right side
    1,305.66x = 838,751.18
  5. Step 5: Solve for x
    x = 838,751.18/1,305.66
  6. Step 6: Final answer
    x = 642.40

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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.