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Finding the Fourth Proportional to 69,991.40, 105,030.65 and 28,438.40

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Solution

The fourth proportional to 69,991.40, 105,030.65 and 28,438.40 is: 42,675.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,991.40 : 105,030.65 = 28,438.40 : x
  2. Step 2: Convert to fraction form
    69,991.40/105,030.65 = 28,438.40/x
  3. Step 3: Cross multiply
    69,991.40x = 105,030.65 × 28,438.40
  4. Step 4: Simplify right side
    69,991.40x = 2,986,902,969.61
  5. Step 5: Solve for x
    x = 2,986,902,969.61/69,991.40
  6. Step 6: Final answer
    x = 42,675.29

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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.