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Finding the Fourth Proportional to 1,198.65, 1,798.02 and 429.15

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Solution

The fourth proportional to 1,198.65, 1,798.02 and 429.15 is: 643.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.65 : 1,798.02 = 429.15 : x
  2. Step 2: Convert to fraction form
    1,198.65/1,798.02 = 429.15/x
  3. Step 3: Cross multiply
    1,198.65x = 1,798.02 × 429.15
  4. Step 4: Simplify right side
    1,198.65x = 771,620.28
  5. Step 5: Solve for x
    x = 771,620.28/1,198.65
  6. Step 6: Final answer
    x = 643.74

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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.