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Finding the Fourth Proportional to 645,305.91, 890,543.91 and 354,939.93

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Solution

The fourth proportional to 645,305.91, 890,543.91 and 354,939.93 is: 489,829.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,305.91 : 890,543.91 = 354,939.93 : x
  2. Step 2: Convert to fraction form
    645,305.91/890,543.91 = 354,939.93/x
  3. Step 3: Cross multiply
    645,305.91x = 890,543.91 × 354,939.93
  4. Step 4: Simplify right side
    645,305.91x = 316,089,593,077.33
  5. Step 5: Solve for x
    x = 316,089,593,077.33/645,305.91
  6. Step 6: Final answer
    x = 489,829.07

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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.