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Finding the Fourth Proportional to 20,643.59, 30,973.58 and 6,605.78

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Solution

The fourth proportional to 20,643.59, 30,973.58 and 6,605.78 is: 9,911.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.59 : 30,973.58 = 6,605.78 : x
  2. Step 2: Convert to fraction form
    20,643.59/30,973.58 = 6,605.78/x
  3. Step 3: Cross multiply
    20,643.59x = 30,973.58 × 6,605.78
  4. Step 4: Simplify right side
    20,643.59x = 204,604,516.94
  5. Step 5: Solve for x
    x = 204,604,516.94/20,643.59
  6. Step 6: Final answer
    x = 9,911.29

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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.