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Finding the Fourth Proportional to 380,999.85, 571,099.71 and 128,192.57

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Solution

The fourth proportional to 380,999.85, 571,099.71 and 128,192.57 is: 192,154.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    380,999.85 : 571,099.71 = 128,192.57 : x
  2. Step 2: Convert to fraction form
    380,999.85/571,099.71 = 128,192.57/x
  3. Step 3: Cross multiply
    380,999.85x = 571,099.71 × 128,192.57
  4. Step 4: Simplify right side
    380,999.85x = 73,210,741,809.35
  5. Step 5: Solve for x
    x = 73,210,741,809.35/380,999.85
  6. Step 6: Final answer
    x = 192,154.25

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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.