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Finding the Fourth Proportional to 1,378.64, 1,898.48 and 1,028.72

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Solution

The fourth proportional to 1,378.64, 1,898.48 and 1,028.72 is: 1,416.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.64 : 1,898.48 = 1,028.72 : x
  2. Step 2: Convert to fraction form
    1,378.64/1,898.48 = 1,028.72/x
  3. Step 3: Cross multiply
    1,378.64x = 1,898.48 × 1,028.72
  4. Step 4: Simplify right side
    1,378.64x = 1,953,004.35
  5. Step 5: Solve for x
    x = 1,953,004.35/1,378.64
  6. Step 6: Final answer
    x = 1,416.62

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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.