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Finding the Fourth Proportional to 764,805.75, 1,055,457.72 and 420,668.31

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Solution

The fourth proportional to 764,805.75, 1,055,457.72 and 420,668.31 is: 580,536.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    764,805.75 : 1,055,457.72 = 420,668.31 : x
  2. Step 2: Convert to fraction form
    764,805.75/1,055,457.72 = 420,668.31/x
  3. Step 3: Cross multiply
    764,805.75x = 1,055,457.72 × 420,668.31
  4. Step 4: Simplify right side
    764,805.75x = 443,997,615,348.85
  5. Step 5: Solve for x
    x = 443,997,615,348.85/764,805.75
  6. Step 6: Final answer
    x = 580,536.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.