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Finding the Fourth Proportional to 1,212.67, 1,673.51 and 947.42

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Solution

The fourth proportional to 1,212.67, 1,673.51 and 947.42 is: 1,307.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.67 : 1,673.51 = 947.42 : x
  2. Step 2: Convert to fraction form
    1,212.67/1,673.51 = 947.42/x
  3. Step 3: Cross multiply
    1,212.67x = 1,673.51 × 947.42
  4. Step 4: Simplify right side
    1,212.67x = 1,585,507.92
  5. Step 5: Solve for x
    x = 1,585,507.92/1,212.67
  6. Step 6: Final answer
    x = 1,307.45

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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.