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Finding the Fourth Proportional to 1,114.48, 1,538 and 617.12

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Solution

The fourth proportional to 1,114.48, 1,538 and 617.12 is: 851.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.48 : 1,538 = 617.12 : x
  2. Step 2: Convert to fraction form
    1,114.48/1,538 = 617.12/x
  3. Step 3: Cross multiply
    1,114.48x = 1,538 × 617.12
  4. Step 4: Simplify right side
    1,114.48x = 949,130.56
  5. Step 5: Solve for x
    x = 949,130.56/1,114.48
  6. Step 6: Final answer
    x = 851.64

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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.