Home / 18,667.90-25,782.45-12,689.20

Finding the Fourth Proportional to 18,667.90, 25,782.45 and 12,689.20

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Solution

The fourth proportional to 18,667.90, 25,782.45 and 12,689.20 is: 17,525.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,667.90 : 25,782.45 = 12,689.20 : x
  2. Step 2: Convert to fraction form
    18,667.90/25,782.45 = 12,689.20/x
  3. Step 3: Cross multiply
    18,667.90x = 25,782.45 × 12,689.20
  4. Step 4: Simplify right side
    18,667.90x = 327,158,535.63
  5. Step 5: Solve for x
    x = 327,158,535.63/18,667.90
  6. Step 6: Final answer
    x = 17,525.20

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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.