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Finding the Fourth Proportional to 1,230.64, 1,838.76 and 1,187.58

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Solution

The fourth proportional to 1,230.64, 1,838.76 and 1,187.58 is: 1,774.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.64 : 1,838.76 = 1,187.58 : x
  2. Step 2: Convert to fraction form
    1,230.64/1,838.76 = 1,187.58/x
  3. Step 3: Cross multiply
    1,230.64x = 1,838.76 × 1,187.58
  4. Step 4: Simplify right side
    1,230.64x = 2,183,674.60
  5. Step 5: Solve for x
    x = 2,183,674.60/1,230.64
  6. Step 6: Final answer
    x = 1,774.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.