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Finding the Fourth Proportional to 13,907.80, 19,188.52 and 7,939.12

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Solution

The fourth proportional to 13,907.80, 19,188.52 and 7,939.12 is: 10,953.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,907.80 : 19,188.52 = 7,939.12 : x
  2. Step 2: Convert to fraction form
    13,907.80/19,188.52 = 7,939.12/x
  3. Step 3: Cross multiply
    13,907.80x = 19,188.52 × 7,939.12
  4. Step 4: Simplify right side
    13,907.80x = 152,339,962.90
  5. Step 5: Solve for x
    x = 152,339,962.90/13,907.80
  6. Step 6: Final answer
    x = 10,953.56

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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.