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Finding the Fourth Proportional to 20,345, 28,111.20 and 16,802.12

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Solution

The fourth proportional to 20,345, 28,111.20 and 16,802.12 is: 23,215.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,345 : 28,111.20 = 16,802.12 : x
  2. Step 2: Convert to fraction form
    20,345/28,111.20 = 16,802.12/x
  3. Step 3: Cross multiply
    20,345x = 28,111.20 × 16,802.12
  4. Step 4: Simplify right side
    20,345x = 472,327,755.74
  5. Step 5: Solve for x
    x = 472,327,755.74/20,345
  6. Step 6: Final answer
    x = 23,215.91

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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.