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Finding the Fourth Proportional to 386,837.70, 580,256.55 and 380,932.80

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Solution

The fourth proportional to 386,837.70, 580,256.55 and 380,932.80 is: 571,399.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,837.70 : 580,256.55 = 380,932.80 : x
  2. Step 2: Convert to fraction form
    386,837.70/580,256.55 = 380,932.80/x
  3. Step 3: Cross multiply
    386,837.70x = 580,256.55 × 380,932.80
  4. Step 4: Simplify right side
    386,837.70x = 221,038,752,309.84
  5. Step 5: Solve for x
    x = 221,038,752,309.84/386,837.70
  6. Step 6: Final answer
    x = 571,399.20

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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.