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Finding the Fourth Proportional to 1,435.96, 1,981.66 and 815

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Solution

The fourth proportional to 1,435.96, 1,981.66 and 815 is: 1,124.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.96 : 1,981.66 = 815 : x
  2. Step 2: Convert to fraction form
    1,435.96/1,981.66 = 815/x
  3. Step 3: Cross multiply
    1,435.96x = 1,981.66 × 815
  4. Step 4: Simplify right side
    1,435.96x = 1,615,052.90
  5. Step 5: Solve for x
    x = 1,615,052.90/1,435.96
  6. Step 6: Final answer
    x = 1,124.72

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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.