Home / 645,140.94-890,317.32-354,774.63

Finding the Fourth Proportional to 645,140.94, 890,317.32 and 354,774.63

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Solution

The fourth proportional to 645,140.94, 890,317.32 and 354,774.63 is: 489,601.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,140.94 : 890,317.32 = 354,774.63 : x
  2. Step 2: Convert to fraction form
    645,140.94/890,317.32 = 354,774.63/x
  3. Step 3: Cross multiply
    645,140.94x = 890,317.32 × 354,774.63
  4. Step 4: Simplify right side
    645,140.94x = 315,861,997,785.59
  5. Step 5: Solve for x
    x = 315,861,997,785.59/645,140.94
  6. Step 6: Final answer
    x = 489,601.54

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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.