Home / 645,236.56-890,403.15-354,845.62

Finding the Fourth Proportional to 645,236.56, 890,403.15 and 354,845.62

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Solution

The fourth proportional to 645,236.56, 890,403.15 and 354,845.62 is: 489,674.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,236.56 : 890,403.15 = 354,845.62 : x
  2. Step 2: Convert to fraction form
    645,236.56/890,403.15 = 354,845.62/x
  3. Step 3: Cross multiply
    645,236.56x = 890,403.15 × 354,845.62
  4. Step 4: Simplify right side
    645,236.56x = 315,955,657,811.70
  5. Step 5: Solve for x
    x = 315,955,657,811.70/645,236.56
  6. Step 6: Final answer
    x = 489,674.14

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Double scale
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1.5x scale

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.