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Finding the Fourth Proportional to 1,417.80, 1,956.64 and 828.68

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Solution

The fourth proportional to 1,417.80, 1,956.64 and 828.68 is: 1,143.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.80 : 1,956.64 = 828.68 : x
  2. Step 2: Convert to fraction form
    1,417.80/1,956.64 = 828.68/x
  3. Step 3: Cross multiply
    1,417.80x = 1,956.64 × 828.68
  4. Step 4: Simplify right side
    1,417.80x = 1,621,428.44
  5. Step 5: Solve for x
    x = 1,621,428.44/1,417.80
  6. Step 6: Final answer
    x = 1,143.62

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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.