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Finding the Fourth Proportional to 1,261.87, 1,894.57 and 646.00

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Solution

The fourth proportional to 1,261.87, 1,894.57 and 646.00 is: 969.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.87 : 1,894.57 = 646.00 : x
  2. Step 2: Convert to fraction form
    1,261.87/1,894.57 = 646.00/x
  3. Step 3: Cross multiply
    1,261.87x = 1,894.57 × 646.00
  4. Step 4: Simplify right side
    1,261.87x = 1,223,885.87
  5. Step 5: Solve for x
    x = 1,223,885.87/1,261.87
  6. Step 6: Final answer
    x = 969.90

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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.