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Finding the Fourth Proportional to 1,103.60, 1,523.70 and 661.65

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Solution

The fourth proportional to 1,103.60, 1,523.70 and 661.65 is: 913.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.60 : 1,523.70 = 661.65 : x
  2. Step 2: Convert to fraction form
    1,103.60/1,523.70 = 661.65/x
  3. Step 3: Cross multiply
    1,103.60x = 1,523.70 × 661.65
  4. Step 4: Simplify right side
    1,103.60x = 1,008,156.11
  5. Step 5: Solve for x
    x = 1,008,156.11/1,103.60
  6. Step 6: Final answer
    x = 913.52

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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.