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Finding the Fourth Proportional to 1,394.51, 1,924.34 and 765.01

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Solution

The fourth proportional to 1,394.51, 1,924.34 and 765.01 is: 1,055.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.51 : 1,924.34 = 765.01 : x
  2. Step 2: Convert to fraction form
    1,394.51/1,924.34 = 765.01/x
  3. Step 3: Cross multiply
    1,394.51x = 1,924.34 × 765.01
  4. Step 4: Simplify right side
    1,394.51x = 1,472,129.72
  5. Step 5: Solve for x
    x = 1,472,129.72/1,394.51
  6. Step 6: Final answer
    x = 1,055.66

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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.