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Finding the Fourth Proportional to 1,788.64, 2,682.96 and 815.02

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Solution

The fourth proportional to 1,788.64, 2,682.96 and 815.02 is: 1,222.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,788.64 : 2,682.96 = 815.02 : x
  2. Step 2: Convert to fraction form
    1,788.64/2,682.96 = 815.02/x
  3. Step 3: Cross multiply
    1,788.64x = 2,682.96 × 815.02
  4. Step 4: Simplify right side
    1,788.64x = 2,186,666.06
  5. Step 5: Solve for x
    x = 2,186,666.06/1,788.64
  6. Step 6: Final answer
    x = 1,222.53

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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.