Home / 20,570.90-28,387.84-11,139.46

Finding the Fourth Proportional to 20,570.90, 28,387.84 and 11,139.46

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Solution

The fourth proportional to 20,570.90, 28,387.84 and 11,139.46 is: 15,372.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.90 : 28,387.84 = 11,139.46 : x
  2. Step 2: Convert to fraction form
    20,570.90/28,387.84 = 11,139.46/x
  3. Step 3: Cross multiply
    20,570.90x = 28,387.84 × 11,139.46
  4. Step 4: Simplify right side
    20,570.90x = 316,225,208.17
  5. Step 5: Solve for x
    x = 316,225,208.17/20,570.90
  6. Step 6: Final answer
    x = 15,372.45

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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.