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Finding the Fourth Proportional to 1,336.55, 2,005.04 and 643.10

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Solution

The fourth proportional to 1,336.55, 2,005.04 and 643.10 is: 964.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.55 : 2,005.04 = 643.10 : x
  2. Step 2: Convert to fraction form
    1,336.55/2,005.04 = 643.10/x
  3. Step 3: Cross multiply
    1,336.55x = 2,005.04 × 643.10
  4. Step 4: Simplify right side
    1,336.55x = 1,289,438.01
  5. Step 5: Solve for x
    x = 1,289,438.01/1,336.55
  6. Step 6: Final answer
    x = 964.75

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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.