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Finding the Fourth Proportional to 91,318.40, 136,891.20 and 53,907.20

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Solution

The fourth proportional to 91,318.40, 136,891.20 and 53,907.20 is: 80,809.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,318.40 : 136,891.20 = 53,907.20 : x
  2. Step 2: Convert to fraction form
    91,318.40/136,891.20 = 53,907.20/x
  3. Step 3: Cross multiply
    91,318.40x = 136,891.20 × 53,907.20
  4. Step 4: Simplify right side
    91,318.40x = 7,379,421,296.64
  5. Step 5: Solve for x
    x = 7,379,421,296.64/91,318.40
  6. Step 6: Final answer
    x = 80,809.80

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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.