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Finding the Fourth Proportional to 3,138.57, 4,707.89 and 947.31

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Solution

The fourth proportional to 3,138.57, 4,707.89 and 947.31 is: 1,420.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.57 : 4,707.89 = 947.31 : x
  2. Step 2: Convert to fraction form
    3,138.57/4,707.89 = 947.31/x
  3. Step 3: Cross multiply
    3,138.57x = 4,707.89 × 947.31
  4. Step 4: Simplify right side
    3,138.57x = 4,459,844.19
  5. Step 5: Solve for x
    x = 4,459,844.19/3,138.57
  6. Step 6: Final answer
    x = 1,420.98

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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.