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Finding the Fourth Proportional to 1,278.04, 1,763.64 and 781.51

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Solution

The fourth proportional to 1,278.04, 1,763.64 and 781.51 is: 1,078.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.04 : 1,763.64 = 781.51 : x
  2. Step 2: Convert to fraction form
    1,278.04/1,763.64 = 781.51/x
  3. Step 3: Cross multiply
    1,278.04x = 1,763.64 × 781.51
  4. Step 4: Simplify right side
    1,278.04x = 1,378,302.30
  5. Step 5: Solve for x
    x = 1,378,302.30/1,278.04
  6. Step 6: Final answer
    x = 1,078.45

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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.