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Finding the Fourth Proportional to 645,014.81, 890,131.07 and 354,638.63

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Solution

The fourth proportional to 645,014.81, 890,131.07 and 354,638.63 is: 489,407.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,014.81 : 890,131.07 = 354,638.63 : x
  2. Step 2: Convert to fraction form
    645,014.81/890,131.07 = 354,638.63/x
  3. Step 3: Cross multiply
    645,014.81x = 890,131.07 × 354,638.63
  4. Step 4: Simplify right side
    645,014.81x = 315,674,861,412.04
  5. Step 5: Solve for x
    x = 315,674,861,412.04/645,014.81
  6. Step 6: Final answer
    x = 489,407.15

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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.