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Finding the Fourth Proportional to 13,479.12, 18,603.12 and 7,890.24

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Solution

The fourth proportional to 13,479.12, 18,603.12 and 7,890.24 is: 10,889.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,479.12 : 18,603.12 = 7,890.24 : x
  2. Step 2: Convert to fraction form
    13,479.12/18,603.12 = 7,890.24/x
  3. Step 3: Cross multiply
    13,479.12x = 18,603.12 × 7,890.24
  4. Step 4: Simplify right side
    13,479.12x = 146,783,081.55
  5. Step 5: Solve for x
    x = 146,783,081.55/13,479.12
  6. Step 6: Final answer
    x = 10,889.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.