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Finding the Fourth Proportional to 15,720.00, 21,693.16 and 8,646.42

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Solution

The fourth proportional to 15,720.00, 21,693.16 and 8,646.42 is: 11,931.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.00 : 21,693.16 = 8,646.42 : x
  2. Step 2: Convert to fraction form
    15,720.00/21,693.16 = 8,646.42/x
  3. Step 3: Cross multiply
    15,720.00x = 21,693.16 × 8,646.42
  4. Step 4: Simplify right side
    15,720.00x = 187,568,264.64
  5. Step 5: Solve for x
    x = 187,568,264.64/15,720.00
  6. Step 6: Final answer
    x = 11,931.83

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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.