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Finding the Fourth Proportional to 1,312.36, 1,968.81 and 763.54

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Solution

The fourth proportional to 1,312.36, 1,968.81 and 763.54 is: 1,145.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.36 : 1,968.81 = 763.54 : x
  2. Step 2: Convert to fraction form
    1,312.36/1,968.81 = 763.54/x
  3. Step 3: Cross multiply
    1,312.36x = 1,968.81 × 763.54
  4. Step 4: Simplify right side
    1,312.36x = 1,503,265.19
  5. Step 5: Solve for x
    x = 1,503,265.19/1,312.36
  6. Step 6: Final answer
    x = 1,145.47

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1.5x scale

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.