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Finding the Fourth Proportional to 421,287.90, 630,619.65 and 303,189.90

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Solution

The fourth proportional to 421,287.90, 630,619.65 and 303,189.90 is: 453,840.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,287.90 : 630,619.65 = 303,189.90 : x
  2. Step 2: Convert to fraction form
    421,287.90/630,619.65 = 303,189.90/x
  3. Step 3: Cross multiply
    421,287.90x = 630,619.65 × 303,189.90
  4. Step 4: Simplify right side
    421,287.90x = 191,197,508,621.54
  5. Step 5: Solve for x
    x = 191,197,508,621.54/421,287.90
  6. Step 6: Final answer
    x = 453,840.49

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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.