Home / 85,523.40-128,285.10-30,112.20

Finding the Fourth Proportional to 85,523.40, 128,285.10 and 30,112.20

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Solution

The fourth proportional to 85,523.40, 128,285.10 and 30,112.20 is: 45,168.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,523.40 : 128,285.10 = 30,112.20 : x
  2. Step 2: Convert to fraction form
    85,523.40/128,285.10 = 30,112.20/x
  3. Step 3: Cross multiply
    85,523.40x = 128,285.10 × 30,112.20
  4. Step 4: Simplify right side
    85,523.40x = 3,862,946,588.22
  5. Step 5: Solve for x
    x = 3,862,946,588.22/85,523.40
  6. Step 6: Final answer
    x = 45,168.30

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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.