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Finding the Fourth Proportional to 12,339.87, 18,509.79 and 4,019.87

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Solution

The fourth proportional to 12,339.87, 18,509.79 and 4,019.87 is: 6,029.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.87 : 18,509.79 = 4,019.87 : x
  2. Step 2: Convert to fraction form
    12,339.87/18,509.79 = 4,019.87/x
  3. Step 3: Cross multiply
    12,339.87x = 18,509.79 × 4,019.87
  4. Step 4: Simplify right side
    12,339.87x = 74,406,962.61
  5. Step 5: Solve for x
    x = 74,406,962.61/12,339.87
  6. Step 6: Final answer
    x = 6,029.80

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1.5x scale

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.