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Finding the Fourth Proportional to 645,336.64, 890,586.20 and 354,960.48

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Solution

The fourth proportional to 645,336.64, 890,586.20 and 354,960.48 is: 489,857.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,336.64 : 890,586.20 = 354,960.48 : x
  2. Step 2: Convert to fraction form
    645,336.64/890,586.20 = 354,960.48/x
  3. Step 3: Cross multiply
    645,336.64x = 890,586.20 × 354,960.48
  4. Step 4: Simplify right side
    645,336.64x = 316,122,905,033.38
  5. Step 5: Solve for x
    x = 316,122,905,033.38/645,336.64
  6. Step 6: Final answer
    x = 489,857.36

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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.