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Finding the Fourth Proportional to 1,261.62, 1,894.18 and 645.74

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Solution

The fourth proportional to 1,261.62, 1,894.18 and 645.74 is: 969.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.62 : 1,894.18 = 645.74 : x
  2. Step 2: Convert to fraction form
    1,261.62/1,894.18 = 645.74/x
  3. Step 3: Cross multiply
    1,261.62x = 1,894.18 × 645.74
  4. Step 4: Simplify right side
    1,261.62x = 1,223,147.79
  5. Step 5: Solve for x
    x = 1,223,147.79/1,261.62
  6. Step 6: Final answer
    x = 969.51

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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.