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Finding the Fourth Proportional to 30,906.48, 42,656.04 and 18,339.60

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Solution

The fourth proportional to 30,906.48, 42,656.04 and 18,339.60 is: 25,311.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,906.48 : 42,656.04 = 18,339.60 : x
  2. Step 2: Convert to fraction form
    30,906.48/42,656.04 = 18,339.60/x
  3. Step 3: Cross multiply
    30,906.48x = 42,656.04 × 18,339.60
  4. Step 4: Simplify right side
    30,906.48x = 782,294,711.18
  5. Step 5: Solve for x
    x = 782,294,711.18/30,906.48
  6. Step 6: Final answer
    x = 25,311.67

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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.