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Finding the Fourth Proportional to 1,990.58, 2,985.50 and 674.19

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Solution

The fourth proportional to 1,990.58, 2,985.50 and 674.19 is: 1,011.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.58 : 2,985.50 = 674.19 : x
  2. Step 2: Convert to fraction form
    1,990.58/2,985.50 = 674.19/x
  3. Step 3: Cross multiply
    1,990.58x = 2,985.50 × 674.19
  4. Step 4: Simplify right side
    1,990.58x = 2,012,795.93
  5. Step 5: Solve for x
    x = 2,012,795.93/1,990.58
  6. Step 6: Final answer
    x = 1,011.16

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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.