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Finding the Fourth Proportional to 19,918.59, 29,879.10 and 5,127.99

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Solution

The fourth proportional to 19,918.59, 29,879.10 and 5,127.99 is: 7,692.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,918.59 : 29,879.10 = 5,127.99 : x
  2. Step 2: Convert to fraction form
    19,918.59/29,879.10 = 5,127.99/x
  3. Step 3: Cross multiply
    19,918.59x = 29,879.10 × 5,127.99
  4. Step 4: Simplify right side
    19,918.59x = 153,219,726.01
  5. Step 5: Solve for x
    x = 153,219,726.01/19,918.59
  6. Step 6: Final answer
    x = 7,692.30

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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.