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Finding the Fourth Proportional to 318,724.34, 439,707.76 and 189,637.00

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Solution

The fourth proportional to 318,724.34, 439,707.76 and 189,637.00 is: 261,620.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,724.34 : 439,707.76 = 189,637.00 : x
  2. Step 2: Convert to fraction form
    318,724.34/439,707.76 = 189,637.00/x
  3. Step 3: Cross multiply
    318,724.34x = 439,707.76 × 189,637.00
  4. Step 4: Simplify right side
    318,724.34x = 83,384,858,909.76
  5. Step 5: Solve for x
    x = 83,384,858,909.76/318,724.34
  6. Step 6: Final answer
    x = 261,620.62

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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.