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Finding the Fourth Proportional to 12,990.78, 19,485.90 and 5,197.50

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Solution

The fourth proportional to 12,990.78, 19,485.90 and 5,197.50 is: 7,796.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.78 : 19,485.90 = 5,197.50 : x
  2. Step 2: Convert to fraction form
    12,990.78/19,485.90 = 5,197.50/x
  3. Step 3: Cross multiply
    12,990.78x = 19,485.90 × 5,197.50
  4. Step 4: Simplify right side
    12,990.78x = 101,277,965.25
  5. Step 5: Solve for x
    x = 101,277,965.25/12,990.78
  6. Step 6: Final answer
    x = 7,796.14

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1.5x scale

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.