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Finding the Fourth Proportional to 426,387.60, 638,803.80 and 347,072.40

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Solution

The fourth proportional to 426,387.60, 638,803.80 and 347,072.40 is: 519,975.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,387.60 : 638,803.80 = 347,072.40 : x
  2. Step 2: Convert to fraction form
    426,387.60/638,803.80 = 347,072.40/x
  3. Step 3: Cross multiply
    426,387.60x = 638,803.80 × 347,072.40
  4. Step 4: Simplify right side
    426,387.60x = 221,711,167,995.12
  5. Step 5: Solve for x
    x = 221,711,167,995.12/426,387.60
  6. Step 6: Final answer
    x = 519,975.65

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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.