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Finding the Fourth Proportional to 1,281.63, 1,922.74 and 415.94

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Solution

The fourth proportional to 1,281.63, 1,922.74 and 415.94 is: 624.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.63 : 1,922.74 = 415.94 : x
  2. Step 2: Convert to fraction form
    1,281.63/1,922.74 = 415.94/x
  3. Step 3: Cross multiply
    1,281.63x = 1,922.74 × 415.94
  4. Step 4: Simplify right side
    1,281.63x = 799,740.71
  5. Step 5: Solve for x
    x = 799,740.71/1,281.63
  6. Step 6: Final answer
    x = 624.01

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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.