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Finding the Fourth Proportional to 1,105.56, 1,655.10 and 617.40

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Solution

The fourth proportional to 1,105.56, 1,655.10 and 617.40 is: 924.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.56 : 1,655.10 = 617.40 : x
  2. Step 2: Convert to fraction form
    1,105.56/1,655.10 = 617.40/x
  3. Step 3: Cross multiply
    1,105.56x = 1,655.10 × 617.40
  4. Step 4: Simplify right side
    1,105.56x = 1,021,858.74
  5. Step 5: Solve for x
    x = 1,021,858.74/1,105.56
  6. Step 6: Final answer
    x = 924.29

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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.