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Finding the Fourth Proportional to 685,422.71, 945,912.89 and 379,499.08

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Solution

The fourth proportional to 685,422.71, 945,912.89 and 379,499.08 is: 523,725.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,422.71 : 945,912.89 = 379,499.08 : x
  2. Step 2: Convert to fraction form
    685,422.71/945,912.89 = 379,499.08/x
  3. Step 3: Cross multiply
    685,422.71x = 945,912.89 × 379,499.08
  4. Step 4: Simplify right side
    685,422.71x = 358,973,071,515.14
  5. Step 5: Solve for x
    x = 358,973,071,515.14/685,422.71
  6. Step 6: Final answer
    x = 523,725.10

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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.