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Finding the Fourth Proportional to 12,840.76, 19,261.98 and 3,955

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Solution

The fourth proportional to 12,840.76, 19,261.98 and 3,955 is: 5,932.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.76 : 19,261.98 = 3,955 : x
  2. Step 2: Convert to fraction form
    12,840.76/19,261.98 = 3,955/x
  3. Step 3: Cross multiply
    12,840.76x = 19,261.98 × 3,955
  4. Step 4: Simplify right side
    12,840.76x = 76,181,130.90
  5. Step 5: Solve for x
    x = 76,181,130.90/12,840.76
  6. Step 6: Final answer
    x = 5,932.76

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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.