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Finding the Fourth Proportional to 19,309.70, 28,980.95 and 7,631.12

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Solution

The fourth proportional to 19,309.70, 28,980.95 and 7,631.12 is: 11,453.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,309.70 : 28,980.95 = 7,631.12 : x
  2. Step 2: Convert to fraction form
    19,309.70/28,980.95 = 7,631.12/x
  3. Step 3: Cross multiply
    19,309.70x = 28,980.95 × 7,631.12
  4. Step 4: Simplify right side
    19,309.70x = 221,156,924.10
  5. Step 5: Solve for x
    x = 221,156,924.10/19,309.70
  6. Step 6: Final answer
    x = 11,453.15

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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.