Home / 20,570.88-28,387.72-11,139.40

Finding the Fourth Proportional to 20,570.88, 28,387.72 and 11,139.40

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Solution

The fourth proportional to 20,570.88, 28,387.72 and 11,139.40 is: 15,372.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.88 : 28,387.72 = 11,139.40 : x
  2. Step 2: Convert to fraction form
    20,570.88/28,387.72 = 11,139.40/x
  3. Step 3: Cross multiply
    20,570.88x = 28,387.72 × 11,139.40
  4. Step 4: Simplify right side
    20,570.88x = 316,222,168.17
  5. Step 5: Solve for x
    x = 316,222,168.17/20,570.88
  6. Step 6: Final answer
    x = 15,372.32

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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.