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Finding the Fourth Proportional to 1,277.52, 1,762.68 and 780.36

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Solution

The fourth proportional to 1,277.52, 1,762.68 and 780.36 is: 1,076.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.52 : 1,762.68 = 780.36 : x
  2. Step 2: Convert to fraction form
    1,277.52/1,762.68 = 780.36/x
  3. Step 3: Cross multiply
    1,277.52x = 1,762.68 × 780.36
  4. Step 4: Simplify right side
    1,277.52x = 1,375,524.96
  5. Step 5: Solve for x
    x = 1,375,524.96/1,277.52
  6. Step 6: Final answer
    x = 1,076.72

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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.