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Finding the Fourth Proportional to 686,845.50, 947,846.80 and 385,039.50

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Solution

The fourth proportional to 686,845.50, 947,846.80 and 385,039.50 is: 531,354.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,845.50 : 947,846.80 = 385,039.50 : x
  2. Step 2: Convert to fraction form
    686,845.50/947,846.80 = 385,039.50/x
  3. Step 3: Cross multiply
    686,845.50x = 947,846.80 × 385,039.50
  4. Step 4: Simplify right side
    686,845.50x = 364,958,457,948.60
  5. Step 5: Solve for x
    x = 364,958,457,948.60/686,845.50
  6. Step 6: Final answer
    x = 531,354.52

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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.