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Finding the Fourth Proportional to 18,969.31, 28,437.89 and 7,869.07

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Solution

The fourth proportional to 18,969.31, 28,437.89 and 7,869.07 is: 11,796.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.31 : 28,437.89 = 7,869.07 : x
  2. Step 2: Convert to fraction form
    18,969.31/28,437.89 = 7,869.07/x
  3. Step 3: Cross multiply
    18,969.31x = 28,437.89 × 7,869.07
  4. Step 4: Simplify right side
    18,969.31x = 223,779,695.64
  5. Step 5: Solve for x
    x = 223,779,695.64/18,969.31
  6. Step 6: Final answer
    x = 11,796.94

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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.