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Finding the Fourth Proportional to 389,387.07, 537,353.88 and 219,621.21

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Solution

The fourth proportional to 389,387.07, 537,353.88 and 219,621.21 is: 303,077.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,387.07 : 537,353.88 = 219,621.21 : x
  2. Step 2: Convert to fraction form
    389,387.07/537,353.88 = 219,621.21/x
  3. Step 3: Cross multiply
    389,387.07x = 537,353.88 × 219,621.21
  4. Step 4: Simplify right side
    389,387.07x = 118,014,309,323.80
  5. Step 5: Solve for x
    x = 118,014,309,323.80/389,387.07
  6. Step 6: Final answer
    x = 303,077.11

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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.