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Finding the Fourth Proportional to 69,780.87, 96,300.14 and 39,978.63

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Solution

The fourth proportional to 69,780.87, 96,300.14 and 39,978.63 is: 55,171.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,780.87 : 96,300.14 = 39,978.63 : x
  2. Step 2: Convert to fraction form
    69,780.87/96,300.14 = 39,978.63/x
  3. Step 3: Cross multiply
    69,780.87x = 96,300.14 × 39,978.63
  4. Step 4: Simplify right side
    69,780.87x = 3,849,947,466.12
  5. Step 5: Solve for x
    x = 3,849,947,466.12/69,780.87
  6. Step 6: Final answer
    x = 55,171.96

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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.