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Finding the Fourth Proportional to 555,387.59, 766,438.55 and 300,738.78

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Solution

The fourth proportional to 555,387.59, 766,438.55 and 300,738.78 is: 415,021.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    555,387.59 : 766,438.55 = 300,738.78 : x
  2. Step 2: Convert to fraction form
    555,387.59/766,438.55 = 300,738.78/x
  3. Step 3: Cross multiply
    555,387.59x = 766,438.55 × 300,738.78
  4. Step 4: Simplify right side
    555,387.59x = 230,497,792,968.28
  5. Step 5: Solve for x
    x = 230,497,792,968.28/555,387.59
  6. Step 6: Final answer
    x = 415,021.51

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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.