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Finding the Fourth Proportional to 1,290.99, 1,781.72 and 767.02

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Solution

The fourth proportional to 1,290.99, 1,781.72 and 767.02 is: 1,058.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.99 : 1,781.72 = 767.02 : x
  2. Step 2: Convert to fraction form
    1,290.99/1,781.72 = 767.02/x
  3. Step 3: Cross multiply
    1,290.99x = 1,781.72 × 767.02
  4. Step 4: Simplify right side
    1,290.99x = 1,366,614.87
  5. Step 5: Solve for x
    x = 1,366,614.87/1,290.99
  6. Step 6: Final answer
    x = 1,058.58

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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.