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Finding the Fourth Proportional to 645,597.72, 890,889.48 and 355,203.78

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Solution

The fourth proportional to 645,597.72, 890,889.48 and 355,203.78 is: 490,161.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,597.72 : 890,889.48 = 355,203.78 : x
  2. Step 2: Convert to fraction form
    645,597.72/890,889.48 = 355,203.78/x
  3. Step 3: Cross multiply
    645,597.72x = 890,889.48 × 355,203.78
  4. Step 4: Simplify right side
    645,597.72x = 316,447,310,858.23
  5. Step 5: Solve for x
    x = 316,447,310,858.23/645,597.72
  6. Step 6: Final answer
    x = 490,161.75

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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.