Home / 645,157.96-890,374.72-354,820.66

Finding the Fourth Proportional to 645,157.96, 890,374.72 and 354,820.66

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Solution

The fourth proportional to 645,157.96, 890,374.72 and 354,820.66 is: 489,683.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,157.96 : 890,374.72 = 354,820.66 : x
  2. Step 2: Convert to fraction form
    645,157.96/890,374.72 = 354,820.66/x
  3. Step 3: Cross multiply
    645,157.96x = 890,374.72 × 354,820.66
  4. Step 4: Simplify right side
    645,157.96x = 315,923,345,797.72
  5. Step 5: Solve for x
    x = 315,923,345,797.72/645,157.96
  6. Step 6: Final answer
    x = 489,683.71

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Double scale
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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.