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Finding the Fourth Proportional to 728,276.80, 1,089,790.80 and 492,080.80

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Solution

The fourth proportional to 728,276.80, 1,089,790.80 and 492,080.80 is: 736,347.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,276.80 : 1,089,790.80 = 492,080.80 : x
  2. Step 2: Convert to fraction form
    728,276.80/1,089,790.80 = 492,080.80/x
  3. Step 3: Cross multiply
    728,276.80x = 1,089,790.80 × 492,080.80
  4. Step 4: Simplify right side
    728,276.80x = 536,265,128,696.64
  5. Step 5: Solve for x
    x = 536,265,128,696.64/728,276.80
  6. Step 6: Final answer
    x = 736,347.95

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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.