Home / 78,069.91-117,105.23-18,905.49

Finding the Fourth Proportional to 78,069.91, 117,105.23 and 18,905.49

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Solution

The fourth proportional to 78,069.91, 117,105.23 and 18,905.49 is: 28,358.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,069.91 : 117,105.23 = 18,905.49 : x
  2. Step 2: Convert to fraction form
    78,069.91/117,105.23 = 18,905.49/x
  3. Step 3: Cross multiply
    78,069.91x = 117,105.23 × 18,905.49
  4. Step 4: Simplify right side
    78,069.91x = 2,213,931,754.71
  5. Step 5: Solve for x
    x = 2,213,931,754.71/78,069.91
  6. Step 6: Final answer
    x = 28,358.32

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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.