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Finding the Fourth Proportional to 1,237.40, 1,855.70 and 415.46

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Solution

The fourth proportional to 1,237.40, 1,855.70 and 415.46 is: 623.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.40 : 1,855.70 = 415.46 : x
  2. Step 2: Convert to fraction form
    1,237.40/1,855.70 = 415.46/x
  3. Step 3: Cross multiply
    1,237.40x = 1,855.70 × 415.46
  4. Step 4: Simplify right side
    1,237.40x = 770,969.12
  5. Step 5: Solve for x
    x = 770,969.12/1,237.40
  6. Step 6: Final answer
    x = 623.06

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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.