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Finding the Fourth Proportional to 3,869.47, 5,804.21 and 947.78

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Solution

The fourth proportional to 3,869.47, 5,804.21 and 947.78 is: 1,421.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,869.47 : 5,804.21 = 947.78 : x
  2. Step 2: Convert to fraction form
    3,869.47/5,804.21 = 947.78/x
  3. Step 3: Cross multiply
    3,869.47x = 5,804.21 × 947.78
  4. Step 4: Simplify right side
    3,869.47x = 5,501,109.41
  5. Step 5: Solve for x
    x = 5,501,109.41/3,869.47
  6. Step 6: Final answer
    x = 1,421.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.