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Finding the Fourth Proportional to 1,420.09, 1,959.72 and 790.67

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Solution

The fourth proportional to 1,420.09, 1,959.72 and 790.67 is: 1,091.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.09 : 1,959.72 = 790.67 : x
  2. Step 2: Convert to fraction form
    1,420.09/1,959.72 = 790.67/x
  3. Step 3: Cross multiply
    1,420.09x = 1,959.72 × 790.67
  4. Step 4: Simplify right side
    1,420.09x = 1,549,493.75
  5. Step 5: Solve for x
    x = 1,549,493.75/1,420.09
  6. Step 6: Final answer
    x = 1,091.13

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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.