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Finding the Fourth Proportional to 20,647.55, 28,492.21 and 11,215.91

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Solution

The fourth proportional to 20,647.55, 28,492.21 and 11,215.91 is: 15,477.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,647.55 : 28,492.21 = 11,215.91 : x
  2. Step 2: Convert to fraction form
    20,647.55/28,492.21 = 11,215.91/x
  3. Step 3: Cross multiply
    20,647.55x = 28,492.21 × 11,215.91
  4. Step 4: Simplify right side
    20,647.55x = 319,566,063.06
  5. Step 5: Solve for x
    x = 319,566,063.06/20,647.55
  6. Step 6: Final answer
    x = 15,477.19

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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.