Home / 20,570.20-28,386.98-11,138.80

Finding the Fourth Proportional to 20,570.20, 28,386.98 and 11,138.80

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Solution

The fourth proportional to 20,570.20, 28,386.98 and 11,138.80 is: 15,371.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.20 : 28,386.98 = 11,138.80 : x
  2. Step 2: Convert to fraction form
    20,570.20/28,386.98 = 11,138.80/x
  3. Step 3: Cross multiply
    20,570.20x = 28,386.98 × 11,138.80
  4. Step 4: Simplify right side
    20,570.20x = 316,196,892.82
  5. Step 5: Solve for x
    x = 316,196,892.82/20,570.20
  6. Step 6: Final answer
    x = 15,371.60

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.