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Finding the Fourth Proportional to 1,420.15, 1,959.93 and 790.90

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Solution

The fourth proportional to 1,420.15, 1,959.93 and 790.90 is: 1,091.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.15 : 1,959.93 = 790.90 : x
  2. Step 2: Convert to fraction form
    1,420.15/1,959.93 = 790.90/x
  3. Step 3: Cross multiply
    1,420.15x = 1,959.93 × 790.90
  4. Step 4: Simplify right side
    1,420.15x = 1,550,108.64
  5. Step 5: Solve for x
    x = 1,550,108.64/1,420.15
  6. Step 6: Final answer
    x = 1,091.51

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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.