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Finding the Fourth Proportional to 1,221.93, 1,686.47 and 779.99

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Solution

The fourth proportional to 1,221.93, 1,686.47 and 779.99 is: 1,076.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.93 : 1,686.47 = 779.99 : x
  2. Step 2: Convert to fraction form
    1,221.93/1,686.47 = 779.99/x
  3. Step 3: Cross multiply
    1,221.93x = 1,686.47 × 779.99
  4. Step 4: Simplify right side
    1,221.93x = 1,315,417.40
  5. Step 5: Solve for x
    x = 1,315,417.40/1,221.93
  6. Step 6: Final answer
    x = 1,076.51

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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.