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Finding the Fourth Proportional to 1,373.12, 2,059.74 and 399.30

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Solution

The fourth proportional to 1,373.12, 2,059.74 and 399.30 is: 598.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.12 : 2,059.74 = 399.30 : x
  2. Step 2: Convert to fraction form
    1,373.12/2,059.74 = 399.30/x
  3. Step 3: Cross multiply
    1,373.12x = 2,059.74 × 399.30
  4. Step 4: Simplify right side
    1,373.12x = 822,444.88
  5. Step 5: Solve for x
    x = 822,444.88/1,373.12
  6. Step 6: Final answer
    x = 598.96

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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.