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Finding the Fourth Proportional to 386,891.70, 580,337.55 and 380,986.80

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Solution

The fourth proportional to 386,891.70, 580,337.55 and 380,986.80 is: 571,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,891.70 : 580,337.55 = 380,986.80 : x
  2. Step 2: Convert to fraction form
    386,891.70/580,337.55 = 380,986.80/x
  3. Step 3: Cross multiply
    386,891.70x = 580,337.55 × 380,986.80
  4. Step 4: Simplify right side
    386,891.70x = 221,100,946,094.34
  5. Step 5: Solve for x
    x = 221,100,946,094.34/386,891.70
  6. Step 6: Final answer
    x = 571,480.20

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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.