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Finding the Fourth Proportional to 1,386, 1,912.68 and 765.04

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Solution

The fourth proportional to 1,386, 1,912.68 and 765.04 is: 1,055.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386 : 1,912.68 = 765.04 : x
  2. Step 2: Convert to fraction form
    1,386/1,912.68 = 765.04/x
  3. Step 3: Cross multiply
    1,386x = 1,912.68 × 765.04
  4. Step 4: Simplify right side
    1,386x = 1,463,276.71
  5. Step 5: Solve for x
    x = 1,463,276.71/1,386
  6. Step 6: Final answer
    x = 1,055.76

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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.