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Finding the Fourth Proportional to 438,632.80, 657,949.20 and 391,976.80

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Solution

The fourth proportional to 438,632.80, 657,949.20 and 391,976.80 is: 587,965.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,632.80 : 657,949.20 = 391,976.80 : x
  2. Step 2: Convert to fraction form
    438,632.80/657,949.20 = 391,976.80/x
  3. Step 3: Cross multiply
    438,632.80x = 657,949.20 × 391,976.80
  4. Step 4: Simplify right side
    438,632.80x = 257,900,821,978.56
  5. Step 5: Solve for x
    x = 257,900,821,978.56/438,632.80
  6. Step 6: Final answer
    x = 587,965.20

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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.