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Finding the Fourth Proportional to 71,319.45, 98,420.81 and 39,488.37

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Solution

The fourth proportional to 71,319.45, 98,420.81 and 39,488.37 is: 54,493.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,319.45 : 98,420.81 = 39,488.37 : x
  2. Step 2: Convert to fraction form
    71,319.45/98,420.81 = 39,488.37/x
  3. Step 3: Cross multiply
    71,319.45x = 98,420.81 × 39,488.37
  4. Step 4: Simplify right side
    71,319.45x = 3,886,477,163.54
  5. Step 5: Solve for x
    x = 3,886,477,163.54/71,319.45
  6. Step 6: Final answer
    x = 54,493.93

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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.