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Finding the Fourth Proportional to 1,290.72, 1,781.20 and 701.26

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Solution

The fourth proportional to 1,290.72, 1,781.20 and 701.26 is: 967.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.72 : 1,781.20 = 701.26 : x
  2. Step 2: Convert to fraction form
    1,290.72/1,781.20 = 701.26/x
  3. Step 3: Cross multiply
    1,290.72x = 1,781.20 × 701.26
  4. Step 4: Simplify right side
    1,290.72x = 1,249,077.28
  5. Step 5: Solve for x
    x = 1,249,077.28/1,290.72
  6. Step 6: Final answer
    x = 967.74

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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.