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Finding the Fourth Proportional to 216,431.97, 324,632.54 and 66,656.64

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Solution

The fourth proportional to 216,431.97, 324,632.54 and 66,656.64 is: 99,980.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,431.97 : 324,632.54 = 66,656.64 : x
  2. Step 2: Convert to fraction form
    216,431.97/324,632.54 = 66,656.64/x
  3. Step 3: Cross multiply
    216,431.97x = 324,632.54 × 66,656.64
  4. Step 4: Simplify right side
    216,431.97x = 21,638,913,909.02
  5. Step 5: Solve for x
    x = 21,638,913,909.02/216,431.97
  6. Step 6: Final answer
    x = 99,980.21

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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.