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Finding the Fourth Proportional to 1,270.66, 1,905.44 and 405.04

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Solution

The fourth proportional to 1,270.66, 1,905.44 and 405.04 is: 607.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.66 : 1,905.44 = 405.04 : x
  2. Step 2: Convert to fraction form
    1,270.66/1,905.44 = 405.04/x
  3. Step 3: Cross multiply
    1,270.66x = 1,905.44 × 405.04
  4. Step 4: Simplify right side
    1,270.66x = 771,779.42
  5. Step 5: Solve for x
    x = 771,779.42/1,270.66
  6. Step 6: Final answer
    x = 607.38

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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.