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Finding the Fourth Proportional to 1,420.47, 1,960.25 and 790.97

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Solution

The fourth proportional to 1,420.47, 1,960.25 and 790.97 is: 1,091.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.47 : 1,960.25 = 790.97 : x
  2. Step 2: Convert to fraction form
    1,420.47/1,960.25 = 790.97/x
  3. Step 3: Cross multiply
    1,420.47x = 1,960.25 × 790.97
  4. Step 4: Simplify right side
    1,420.47x = 1,550,485.19
  5. Step 5: Solve for x
    x = 1,550,485.19/1,420.47
  6. Step 6: Final answer
    x = 1,091.53

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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.