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Finding the Fourth Proportional to 325,357.55, 485,821.57 and 287,087.88

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Solution

The fourth proportional to 325,357.55, 485,821.57 and 287,087.88 is: 428,677.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    325,357.55 : 485,821.57 = 287,087.88 : x
  2. Step 2: Convert to fraction form
    325,357.55/485,821.57 = 287,087.88/x
  3. Step 3: Cross multiply
    325,357.55x = 485,821.57 × 287,087.88
  4. Step 4: Simplify right side
    325,357.55x = 139,473,484,589.57
  5. Step 5: Solve for x
    x = 139,473,484,589.57/325,357.55
  6. Step 6: Final answer
    x = 428,677.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.