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Finding the Fourth Proportional to 393,421.20, 590,131.80 and 349,134.45

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Solution

The fourth proportional to 393,421.20, 590,131.80 and 349,134.45 is: 523,701.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,421.20 : 590,131.80 = 349,134.45 : x
  2. Step 2: Convert to fraction form
    393,421.20/590,131.80 = 349,134.45/x
  3. Step 3: Cross multiply
    393,421.20x = 590,131.80 × 349,134.45
  4. Step 4: Simplify right side
    393,421.20x = 206,035,341,420.51
  5. Step 5: Solve for x
    x = 206,035,341,420.51/393,421.20
  6. Step 6: Final answer
    x = 523,701.68

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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.