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Finding the Fourth Proportional to 438,634.80, 658,211.40 and 320,007.60

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Solution

The fourth proportional to 438,634.80, 658,211.40 and 320,007.60 is: 480,200.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,634.80 : 658,211.40 = 320,007.60 : x
  2. Step 2: Convert to fraction form
    438,634.80/658,211.40 = 320,007.60/x
  3. Step 3: Cross multiply
    438,634.80x = 658,211.40 × 320,007.60
  4. Step 4: Simplify right side
    438,634.80x = 210,632,650,406.64
  5. Step 5: Solve for x
    x = 210,632,650,406.64/438,634.80
  6. Step 6: Final answer
    x = 480,200.50

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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.