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Finding the Fourth Proportional to 644,412.56, 889,289.60 and 357,959.36

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Solution

The fourth proportional to 644,412.56, 889,289.60 and 357,959.36 is: 493,984.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,412.56 : 889,289.60 = 357,959.36 : x
  2. Step 2: Convert to fraction form
    644,412.56/889,289.60 = 357,959.36/x
  3. Step 3: Cross multiply
    644,412.56x = 889,289.60 × 357,959.36
  4. Step 4: Simplify right side
    644,412.56x = 318,329,536,070.66
  5. Step 5: Solve for x
    x = 318,329,536,070.66/644,412.56
  6. Step 6: Final answer
    x = 493,984.07

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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.