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Finding the Fourth Proportional to 612,803.10, 918,909.39 and 213,435.03

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Solution

The fourth proportional to 612,803.10, 918,909.39 and 213,435.03 is: 320,049.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,803.10 : 918,909.39 = 213,435.03 : x
  2. Step 2: Convert to fraction form
    612,803.10/918,909.39 = 213,435.03/x
  3. Step 3: Cross multiply
    612,803.10x = 918,909.39 × 213,435.03
  4. Step 4: Simplify right side
    612,803.10x = 196,127,453,221.93
  5. Step 5: Solve for x
    x = 196,127,453,221.93/612,803.10
  6. Step 6: Final answer
    x = 320,049.71

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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.