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Finding the Fourth Proportional to 216,643.68, 324,974.16 and 66,870.72

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Solution

The fourth proportional to 216,643.68, 324,974.16 and 66,870.72 is: 100,308.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,643.68 : 324,974.16 = 66,870.72 : x
  2. Step 2: Convert to fraction form
    216,643.68/324,974.16 = 66,870.72/x
  3. Step 3: Cross multiply
    216,643.68x = 324,974.16 × 66,870.72
  4. Step 4: Simplify right side
    216,643.68x = 21,731,256,060.60
  5. Step 5: Solve for x
    x = 21,731,256,060.60/216,643.68
  6. Step 6: Final answer
    x = 100,308.75

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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.