Home / 13,126.80-19,657.80-8,720.40

Finding the Fourth Proportional to 13,126.80, 19,657.80 and 8,720.40

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Solution

The fourth proportional to 13,126.80, 19,657.80 and 8,720.40 is: 13,059.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,126.80 : 19,657.80 = 8,720.40 : x
  2. Step 2: Convert to fraction form
    13,126.80/19,657.80 = 8,720.40/x
  3. Step 3: Cross multiply
    13,126.80x = 19,657.80 × 8,720.40
  4. Step 4: Simplify right side
    13,126.80x = 171,423,879.12
  5. Step 5: Solve for x
    x = 171,423,879.12/13,126.80
  6. Step 6: Final answer
    x = 13,059.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.