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Finding the Fourth Proportional to 1,247.94, 1,870.29 and 936.90

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Solution

The fourth proportional to 1,247.94, 1,870.29 and 936.90 is: 1,404.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.94 : 1,870.29 = 936.90 : x
  2. Step 2: Convert to fraction form
    1,247.94/1,870.29 = 936.90/x
  3. Step 3: Cross multiply
    1,247.94x = 1,870.29 × 936.90
  4. Step 4: Simplify right side
    1,247.94x = 1,752,274.70
  5. Step 5: Solve for x
    x = 1,752,274.70/1,247.94
  6. Step 6: Final answer
    x = 1,404.13

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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.