Home / 15,643.14-21,570.87-12,789.18

Finding the Fourth Proportional to 15,643.14, 21,570.87 and 12,789.18

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Solution

The fourth proportional to 15,643.14, 21,570.87 and 12,789.18 is: 17,635.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,643.14 : 21,570.87 = 12,789.18 : x
  2. Step 2: Convert to fraction form
    15,643.14/21,570.87 = 12,789.18/x
  3. Step 3: Cross multiply
    15,643.14x = 21,570.87 × 12,789.18
  4. Step 4: Simplify right side
    15,643.14x = 275,873,739.19
  5. Step 5: Solve for x
    x = 275,873,739.19/15,643.14
  6. Step 6: Final answer
    x = 17,635.45

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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.