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Finding the Fourth Proportional to 1,645.28, 2,465.28 and 865.25

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Solution

The fourth proportional to 1,645.28, 2,465.28 and 865.25 is: 1,296.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.28 : 2,465.28 = 865.25 : x
  2. Step 2: Convert to fraction form
    1,645.28/2,465.28 = 865.25/x
  3. Step 3: Cross multiply
    1,645.28x = 2,465.28 × 865.25
  4. Step 4: Simplify right side
    1,645.28x = 2,133,071.19
  5. Step 5: Solve for x
    x = 2,133,071.19/1,645.28
  6. Step 6: Final answer
    x = 1,296.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.