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Finding the Fourth Proportional to 1,270, 1,905 and 404.40

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Solution

The fourth proportional to 1,270, 1,905 and 404.40 is: 606.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270 : 1,905 = 404.40 : x
  2. Step 2: Convert to fraction form
    1,270/1,905 = 404.40/x
  3. Step 3: Cross multiply
    1,270x = 1,905 × 404.40
  4. Step 4: Simplify right side
    1,270x = 770,382
  5. Step 5: Solve for x
    x = 770,382/1,270
  6. Step 6: Final answer
    x = 606.60

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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.