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Finding the Fourth Proportional to 124,428.80, 186,643.20 and 74,662.40

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Solution

The fourth proportional to 124,428.80, 186,643.20 and 74,662.40 is: 111,993.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,428.80 : 186,643.20 = 74,662.40 : x
  2. Step 2: Convert to fraction form
    124,428.80/186,643.20 = 74,662.40/x
  3. Step 3: Cross multiply
    124,428.80x = 186,643.20 × 74,662.40
  4. Step 4: Simplify right side
    124,428.80x = 13,935,229,255.68
  5. Step 5: Solve for x
    x = 13,935,229,255.68/124,428.80
  6. Step 6: Final answer
    x = 111,993.60

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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.