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Finding the Fourth Proportional to 421,707.79, 581,351.45 and 300,638.88

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Solution

The fourth proportional to 421,707.79, 581,351.45 and 300,638.88 is: 414,450.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,707.79 : 581,351.45 = 300,638.88 : x
  2. Step 2: Convert to fraction form
    421,707.79/581,351.45 = 300,638.88/x
  3. Step 3: Cross multiply
    421,707.79x = 581,351.45 × 300,638.88
  4. Step 4: Simplify right side
    421,707.79x = 174,776,847,311.18
  5. Step 5: Solve for x
    x = 174,776,847,311.18/421,707.79
  6. Step 6: Final answer
    x = 414,450.13

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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.