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Finding the Fourth Proportional to 1,903.90, 2,856.47 and 808.28

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Solution

The fourth proportional to 1,903.90, 2,856.47 and 808.28 is: 1,212.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,903.90 : 2,856.47 = 808.28 : x
  2. Step 2: Convert to fraction form
    1,903.90/2,856.47 = 808.28/x
  3. Step 3: Cross multiply
    1,903.90x = 2,856.47 × 808.28
  4. Step 4: Simplify right side
    1,903.90x = 2,308,827.57
  5. Step 5: Solve for x
    x = 2,308,827.57/1,903.90
  6. Step 6: Final answer
    x = 1,212.68

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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.