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Finding the Fourth Proportional to 645,599.72, 890,892.24 and 355,205.78

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Solution

The fourth proportional to 645,599.72, 890,892.24 and 355,205.78 is: 490,164.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,599.72 : 890,892.24 = 355,205.78 : x
  2. Step 2: Convert to fraction form
    645,599.72/890,892.24 = 355,205.78/x
  3. Step 3: Cross multiply
    645,599.72x = 890,892.24 × 355,205.78
  4. Step 4: Simplify right side
    645,599.72x = 316,450,073,005.15
  5. Step 5: Solve for x
    x = 316,450,073,005.15/645,599.72
  6. Step 6: Final answer
    x = 490,164.51

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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.