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Finding the Fourth Proportional to 1,212.93, 1,674.63 and 947.66

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Solution

The fourth proportional to 1,212.93, 1,674.63 and 947.66 is: 1,308.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.93 : 1,674.63 = 947.66 : x
  2. Step 2: Convert to fraction form
    1,212.93/1,674.63 = 947.66/x
  3. Step 3: Cross multiply
    1,212.93x = 1,674.63 × 947.66
  4. Step 4: Simplify right side
    1,212.93x = 1,586,971.49
  5. Step 5: Solve for x
    x = 1,586,971.49/1,212.93
  6. Step 6: Final answer
    x = 1,308.38

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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.