Home / 15,720.45-21,693.71-8,646.81

Finding the Fourth Proportional to 15,720.45, 21,693.71 and 8,646.81

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Solution

The fourth proportional to 15,720.45, 21,693.71 and 8,646.81 is: 11,932.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.45 : 21,693.71 = 8,646.81 : x
  2. Step 2: Convert to fraction form
    15,720.45/21,693.71 = 8,646.81/x
  3. Step 3: Cross multiply
    15,720.45x = 21,693.71 × 8,646.81
  4. Step 4: Simplify right side
    15,720.45x = 187,581,345.33
  5. Step 5: Solve for x
    x = 187,581,345.33/15,720.45
  6. Step 6: Final answer
    x = 11,932.31

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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.