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Finding the Fourth Proportional to 15,771.67, 21,763.99 and 9,405.47

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Solution

The fourth proportional to 15,771.67, 21,763.99 and 9,405.47 is: 12,979.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,771.67 : 21,763.99 = 9,405.47 : x
  2. Step 2: Convert to fraction form
    15,771.67/21,763.99 = 9,405.47/x
  3. Step 3: Cross multiply
    15,771.67x = 21,763.99 × 9,405.47
  4. Step 4: Simplify right side
    15,771.67x = 204,700,621.19
  5. Step 5: Solve for x
    x = 204,700,621.19/15,771.67
  6. Step 6: Final answer
    x = 12,979.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.