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Finding the Fourth Proportional to 2,643.42, 3,964.65 and 999.90

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Solution

The fourth proportional to 2,643.42, 3,964.65 and 999.90 is: 1,499.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.42 : 3,964.65 = 999.90 : x
  2. Step 2: Convert to fraction form
    2,643.42/3,964.65 = 999.90/x
  3. Step 3: Cross multiply
    2,643.42x = 3,964.65 × 999.90
  4. Step 4: Simplify right side
    2,643.42x = 3,964,253.54
  5. Step 5: Solve for x
    x = 3,964,253.54/2,643.42
  6. Step 6: Final answer
    x = 1,499.67

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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.