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Finding the Fourth Proportional to 85,611.25, 128,475.20 and 30,207.25

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Solution

The fourth proportional to 85,611.25, 128,475.20 and 30,207.25 is: 45,331.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.25 : 128,475.20 = 30,207.25 : x
  2. Step 2: Convert to fraction form
    85,611.25/128,475.20 = 30,207.25/x
  3. Step 3: Cross multiply
    85,611.25x = 128,475.20 × 30,207.25
  4. Step 4: Simplify right side
    85,611.25x = 3,880,882,485.20
  5. Step 5: Solve for x
    x = 3,880,882,485.20/85,611.25
  6. Step 6: Final answer
    x = 45,331.45

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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.