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Finding the Fourth Proportional to 438,640.80, 657,961.20 and 397,962.60

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Solution

The fourth proportional to 438,640.80, 657,961.20 and 397,962.60 is: 596,943.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,640.80 : 657,961.20 = 397,962.60 : x
  2. Step 2: Convert to fraction form
    438,640.80/657,961.20 = 397,962.60/x
  3. Step 3: Cross multiply
    438,640.80x = 657,961.20 × 397,962.60
  4. Step 4: Simplify right side
    438,640.80x = 261,843,949,851.12
  5. Step 5: Solve for x
    x = 261,843,949,851.12/438,640.80
  6. Step 6: Final answer
    x = 596,943.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.