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Finding the Fourth Proportional to 666,885.69, 920,293.65 and 380,410.56

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Solution

The fourth proportional to 666,885.69, 920,293.65 and 380,410.56 is: 524,961.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,885.69 : 920,293.65 = 380,410.56 : x
  2. Step 2: Convert to fraction form
    666,885.69/920,293.65 = 380,410.56/x
  3. Step 3: Cross multiply
    666,885.69x = 920,293.65 × 380,410.56
  4. Step 4: Simplify right side
    666,885.69x = 350,089,422,760.94
  5. Step 5: Solve for x
    x = 350,089,422,760.94/666,885.69
  6. Step 6: Final answer
    x = 524,961.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.