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Finding the Fourth Proportional to 12,930.59, 19,395.95 and 5,139.42

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Solution

The fourth proportional to 12,930.59, 19,395.95 and 5,139.42 is: 7,709.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,930.59 : 19,395.95 = 5,139.42 : x
  2. Step 2: Convert to fraction form
    12,930.59/19,395.95 = 5,139.42/x
  3. Step 3: Cross multiply
    12,930.59x = 19,395.95 × 5,139.42
  4. Step 4: Simplify right side
    12,930.59x = 99,683,907.65
  5. Step 5: Solve for x
    x = 99,683,907.65/12,930.59
  6. Step 6: Final answer
    x = 7,709.16

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