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Finding the Fourth Proportional to 705,840.45, 973,980.75 and 399,851.28

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Solution

The fourth proportional to 705,840.45, 973,980.75 and 399,851.28 is: 551,749.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    705,840.45 : 973,980.75 = 399,851.28 : x
  2. Step 2: Convert to fraction form
    705,840.45/973,980.75 = 399,851.28/x
  3. Step 3: Cross multiply
    705,840.45x = 973,980.75 × 399,851.28
  4. Step 4: Simplify right side
    705,840.45x = 389,447,449,582.86
  5. Step 5: Solve for x
    x = 389,447,449,582.86/705,840.45
  6. Step 6: Final answer
    x = 551,749.97

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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.