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Finding the Fourth Proportional to 77,474.40, 116,211.60 and 72,290.40

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Solution

The fourth proportional to 77,474.40, 116,211.60 and 72,290.40 is: 108,435.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,474.40 : 116,211.60 = 72,290.40 : x
  2. Step 2: Convert to fraction form
    77,474.40/116,211.60 = 72,290.40/x
  3. Step 3: Cross multiply
    77,474.40x = 116,211.60 × 72,290.40
  4. Step 4: Simplify right side
    77,474.40x = 8,400,983,048.64
  5. Step 5: Solve for x
    x = 8,400,983,048.64/77,474.40
  6. Step 6: Final answer
    x = 108,435.60

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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.