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Finding the Fourth Proportional to 19,107, 28,664.58 and 7,420.20

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Solution

The fourth proportional to 19,107, 28,664.58 and 7,420.20 is: 11,131.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,107 : 28,664.58 = 7,420.20 : x
  2. Step 2: Convert to fraction form
    19,107/28,664.58 = 7,420.20/x
  3. Step 3: Cross multiply
    19,107x = 28,664.58 × 7,420.20
  4. Step 4: Simplify right side
    19,107x = 212,696,916.52
  5. Step 5: Solve for x
    x = 212,696,916.52/19,107
  6. Step 6: Final answer
    x = 11,131.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.