Home / 15,729.99-21,706.85-8,656.40

Finding the Fourth Proportional to 15,729.99, 21,706.85 and 8,656.40

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Solution

The fourth proportional to 15,729.99, 21,706.85 and 8,656.40 is: 11,945.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,729.99 : 21,706.85 = 8,656.40 : x
  2. Step 2: Convert to fraction form
    15,729.99/21,706.85 = 8,656.40/x
  3. Step 3: Cross multiply
    15,729.99x = 21,706.85 × 8,656.40
  4. Step 4: Simplify right side
    15,729.99x = 187,903,089.45
  5. Step 5: Solve for x
    x = 187,903,089.45/15,729.99
  6. Step 6: Final answer
    x = 11,945.53

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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.