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Finding the Fourth Proportional to 686,847.40, 947,848.84 and 385,041.40

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Solution

The fourth proportional to 686,847.40, 947,848.84 and 385,041.40 is: 531,356.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,847.40 : 947,848.84 = 385,041.40 : x
  2. Step 2: Convert to fraction form
    686,847.40/947,848.84 = 385,041.40/x
  3. Step 3: Cross multiply
    686,847.40x = 947,848.84 × 385,041.40
  4. Step 4: Simplify right side
    686,847.40x = 364,961,041,009.75
  5. Step 5: Solve for x
    x = 364,961,041,009.75/686,847.40
  6. Step 6: Final answer
    x = 531,356.81

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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.