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Finding the Fourth Proportional to 74,428.80, 111,643.20 and 71,804.40

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Solution

The fourth proportional to 74,428.80, 111,643.20 and 71,804.40 is: 107,706.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,428.80 : 111,643.20 = 71,804.40 : x
  2. Step 2: Convert to fraction form
    74,428.80/111,643.20 = 71,804.40/x
  3. Step 3: Cross multiply
    74,428.80x = 111,643.20 × 71,804.40
  4. Step 4: Simplify right side
    74,428.80x = 8,016,472,990.08
  5. Step 5: Solve for x
    x = 8,016,472,990.08/74,428.80
  6. Step 6: Final answer
    x = 107,706.60

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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.