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Finding the Fourth Proportional to 1,407.81, 2,113.64 and 791.95

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Solution

The fourth proportional to 1,407.81, 2,113.64 and 791.95 is: 1,189.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.81 : 2,113.64 = 791.95 : x
  2. Step 2: Convert to fraction form
    1,407.81/2,113.64 = 791.95/x
  3. Step 3: Cross multiply
    1,407.81x = 2,113.64 × 791.95
  4. Step 4: Simplify right side
    1,407.81x = 1,673,898.60
  5. Step 5: Solve for x
    x = 1,673,898.60/1,407.81
  6. Step 6: Final answer
    x = 1,189.01

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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.