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Finding the Fourth Proportional to 1,412.12, 1,949.70 and 947

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Solution

The fourth proportional to 1,412.12, 1,949.70 and 947 is: 1,307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.12 : 1,949.70 = 947 : x
  2. Step 2: Convert to fraction form
    1,412.12/1,949.70 = 947/x
  3. Step 3: Cross multiply
    1,412.12x = 1,949.70 × 947
  4. Step 4: Simplify right side
    1,412.12x = 1,846,365.90
  5. Step 5: Solve for x
    x = 1,846,365.90/1,412.12
  6. Step 6: Final answer
    x = 1,307.51

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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.