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Finding the Fourth Proportional to 66,391.60, 99,441.60 and 57,643.60

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Solution

The fourth proportional to 66,391.60, 99,441.60 and 57,643.60 is: 86,338.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,391.60 : 99,441.60 = 57,643.60 : x
  2. Step 2: Convert to fraction form
    66,391.60/99,441.60 = 57,643.60/x
  3. Step 3: Cross multiply
    66,391.60x = 99,441.60 × 57,643.60
  4. Step 4: Simplify right side
    66,391.60x = 5,732,171,813.76
  5. Step 5: Solve for x
    x = 5,732,171,813.76/66,391.60
  6. Step 6: Final answer
    x = 86,338.81

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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.