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Finding the Fourth Proportional to 1,992.16, 2,989.62 and 693.63

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Solution

The fourth proportional to 1,992.16, 2,989.62 and 693.63 is: 1,040.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.16 : 2,989.62 = 693.63 : x
  2. Step 2: Convert to fraction form
    1,992.16/2,989.62 = 693.63/x
  3. Step 3: Cross multiply
    1,992.16x = 2,989.62 × 693.63
  4. Step 4: Simplify right side
    1,992.16x = 2,073,690.12
  5. Step 5: Solve for x
    x = 2,073,690.12/1,992.16
  6. Step 6: Final answer
    x = 1,040.92

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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.