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Finding the Fourth Proportional to 66,915.51, 100,378.13 and 20,172.03

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Solution

The fourth proportional to 66,915.51, 100,378.13 and 20,172.03 is: 30,259.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,915.51 : 100,378.13 = 20,172.03 : x
  2. Step 2: Convert to fraction form
    66,915.51/100,378.13 = 20,172.03/x
  3. Step 3: Cross multiply
    66,915.51x = 100,378.13 × 20,172.03
  4. Step 4: Simplify right side
    66,915.51x = 2,024,830,548.84
  5. Step 5: Solve for x
    x = 2,024,830,548.84/66,915.51
  6. Step 6: Final answer
    x = 30,259.51

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1.5x scale

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.