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Finding the Fourth Proportional to 66,643.36, 99,980.86 and 19,895.02

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Solution

The fourth proportional to 66,643.36, 99,980.86 and 19,895.02 is: 29,847.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,643.36 : 99,980.86 = 19,895.02 : x
  2. Step 2: Convert to fraction form
    66,643.36/99,980.86 = 19,895.02/x
  3. Step 3: Cross multiply
    66,643.36x = 99,980.86 × 19,895.02
  4. Step 4: Simplify right side
    66,643.36x = 1,989,121,209.32
  5. Step 5: Solve for x
    x = 1,989,121,209.32/66,643.36
  6. Step 6: Final answer
    x = 29,847.25

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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.