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Finding the Fourth Proportional to 1,646, 2,271.75 and 947.78

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Solution

The fourth proportional to 1,646, 2,271.75 and 947.78 is: 1,308.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,646 : 2,271.75 = 947.78 : x
  2. Step 2: Convert to fraction form
    1,646/2,271.75 = 947.78/x
  3. Step 3: Cross multiply
    1,646x = 2,271.75 × 947.78
  4. Step 4: Simplify right side
    1,646x = 2,153,119.22
  5. Step 5: Solve for x
    x = 2,153,119.22/1,646
  6. Step 6: Final answer
    x = 1,308.09

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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.