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Finding the Fourth Proportional to 1,296.55, 1,788.65 and 765.08

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Solution

The fourth proportional to 1,296.55, 1,788.65 and 765.08 is: 1,055.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.55 : 1,788.65 = 765.08 : x
  2. Step 2: Convert to fraction form
    1,296.55/1,788.65 = 765.08/x
  3. Step 3: Cross multiply
    1,296.55x = 1,788.65 × 765.08
  4. Step 4: Simplify right side
    1,296.55x = 1,368,457.15
  5. Step 5: Solve for x
    x = 1,368,457.15/1,296.55
  6. Step 6: Final answer
    x = 1,055.46

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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.