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Finding the Fourth Proportional to 644,761.60, 889,852.82 and 390,114.88

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Solution

The fourth proportional to 644,761.60, 889,852.82 and 390,114.88 is: 538,408.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,761.60 : 889,852.82 = 390,114.88 : x
  2. Step 2: Convert to fraction form
    644,761.60/889,852.82 = 390,114.88/x
  3. Step 3: Cross multiply
    644,761.60x = 889,852.82 × 390,114.88
  4. Step 4: Simplify right side
    644,761.60x = 347,144,826,091.96
  5. Step 5: Solve for x
    x = 347,144,826,091.96/644,761.60
  6. Step 6: Final answer
    x = 538,408.03

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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.