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Finding the Fourth Proportional to 1,266.76, 1,748.31 and 913.60

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Solution

The fourth proportional to 1,266.76, 1,748.31 and 913.60 is: 1,260.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.76 : 1,748.31 = 913.60 : x
  2. Step 2: Convert to fraction form
    1,266.76/1,748.31 = 913.60/x
  3. Step 3: Cross multiply
    1,266.76x = 1,748.31 × 913.60
  4. Step 4: Simplify right side
    1,266.76x = 1,597,256.02
  5. Step 5: Solve for x
    x = 1,597,256.02/1,266.76
  6. Step 6: Final answer
    x = 1,260.90

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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.