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Finding the Fourth Proportional to 1,386.88, 1,913.91 and 765.88

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Solution

The fourth proportional to 1,386.88, 1,913.91 and 765.88 is: 1,056.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.88 : 1,913.91 = 765.88 : x
  2. Step 2: Convert to fraction form
    1,386.88/1,913.91 = 765.88/x
  3. Step 3: Cross multiply
    1,386.88x = 1,913.91 × 765.88
  4. Step 4: Simplify right side
    1,386.88x = 1,465,825.39
  5. Step 5: Solve for x
    x = 1,465,825.39/1,386.88
  6. Step 6: Final answer
    x = 1,056.92

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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.