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Finding the Fourth Proportional to 1,205.12, 1,807.99 and 425.30

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Solution

The fourth proportional to 1,205.12, 1,807.99 and 425.30 is: 638.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.12 : 1,807.99 = 425.30 : x
  2. Step 2: Convert to fraction form
    1,205.12/1,807.99 = 425.30/x
  3. Step 3: Cross multiply
    1,205.12x = 1,807.99 × 425.30
  4. Step 4: Simplify right side
    1,205.12x = 768,928.04
  5. Step 5: Solve for x
    x = 768,928.04/1,205.12
  6. Step 6: Final answer
    x = 638.05

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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.