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Finding the Fourth Proportional to 19,969.81, 29,956.30 and 6,642.30

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Solution

The fourth proportional to 19,969.81, 29,956.30 and 6,642.30 is: 9,963.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,969.81 : 29,956.30 = 6,642.30 : x
  2. Step 2: Convert to fraction form
    19,969.81/29,956.30 = 6,642.30/x
  3. Step 3: Cross multiply
    19,969.81x = 29,956.30 × 6,642.30
  4. Step 4: Simplify right side
    19,969.81x = 198,978,827.22
  5. Step 5: Solve for x
    x = 198,978,827.22/19,969.81
  6. Step 6: Final answer
    x = 9,963.98

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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.