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Finding the Fourth Proportional to 393,291.74, 543,276.86 and 308,323.47

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Solution

The fourth proportional to 393,291.74, 543,276.86 and 308,323.47 is: 425,905.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,291.74 : 543,276.86 = 308,323.47 : x
  2. Step 2: Convert to fraction form
    393,291.74/543,276.86 = 308,323.47/x
  3. Step 3: Cross multiply
    393,291.74x = 543,276.86 × 308,323.47
  4. Step 4: Simplify right side
    393,291.74x = 167,505,003,929.52
  5. Step 5: Solve for x
    x = 167,505,003,929.52/393,291.74
  6. Step 6: Final answer
    x = 425,905.22

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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.