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Finding the Fourth Proportional to 809,611.40, 1,214,762.70 and 388,670.60

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Solution

The fourth proportional to 809,611.40, 1,214,762.70 and 388,670.60 is: 583,171.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,611.40 : 1,214,762.70 = 388,670.60 : x
  2. Step 2: Convert to fraction form
    809,611.40/1,214,762.70 = 388,670.60/x
  3. Step 3: Cross multiply
    809,611.40x = 1,214,762.70 × 388,670.60
  4. Step 4: Simplify right side
    809,611.40x = 472,142,547,466.62
  5. Step 5: Solve for x
    x = 472,142,547,466.62/809,611.40
  6. Step 6: Final answer
    x = 583,171.81

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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.