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Finding the Fourth Proportional to 99,980.99, 149,805.40 and 70,336.54

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Solution

The fourth proportional to 99,980.99, 149,805.40 and 70,336.54 is: 105,387.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,980.99 : 149,805.40 = 70,336.54 : x
  2. Step 2: Convert to fraction form
    99,980.99/149,805.40 = 70,336.54/x
  3. Step 3: Cross multiply
    99,980.99x = 149,805.40 × 70,336.54
  4. Step 4: Simplify right side
    99,980.99x = 10,536,793,509.32
  5. Step 5: Solve for x
    x = 10,536,793,509.32/99,980.99
  6. Step 6: Final answer
    x = 105,387.97

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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.