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Finding the Fourth Proportional to 1,256.75, 1,881.61 and 947.63

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Solution

The fourth proportional to 1,256.75, 1,881.61 and 947.63 is: 1,418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.75 : 1,881.61 = 947.63 : x
  2. Step 2: Convert to fraction form
    1,256.75/1,881.61 = 947.63/x
  3. Step 3: Cross multiply
    1,256.75x = 1,881.61 × 947.63
  4. Step 4: Simplify right side
    1,256.75x = 1,783,077.75
  5. Step 5: Solve for x
    x = 1,783,077.75/1,256.75
  6. Step 6: Final answer
    x = 1,418.80

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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.