Home / 20,570.75-28,387.65-11,139.32

Finding the Fourth Proportional to 20,570.75, 28,387.65 and 11,139.32

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Solution

The fourth proportional to 20,570.75, 28,387.65 and 11,139.32 is: 15,372.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.75 : 28,387.65 = 11,139.32 : x
  2. Step 2: Convert to fraction form
    20,570.75/28,387.65 = 11,139.32/x
  3. Step 3: Cross multiply
    20,570.75x = 28,387.65 × 11,139.32
  4. Step 4: Simplify right side
    20,570.75x = 316,219,117.40
  5. Step 5: Solve for x
    x = 316,219,117.40/20,570.75
  6. Step 6: Final answer
    x = 15,372.27

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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.