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Finding the Fourth Proportional to 1,266.48, 1,899.78 and 400.76

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Solution

The fourth proportional to 1,266.48, 1,899.78 and 400.76 is: 601.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.48 : 1,899.78 = 400.76 : x
  2. Step 2: Convert to fraction form
    1,266.48/1,899.78 = 400.76/x
  3. Step 3: Cross multiply
    1,266.48x = 1,899.78 × 400.76
  4. Step 4: Simplify right side
    1,266.48x = 761,355.83
  5. Step 5: Solve for x
    x = 761,355.83/1,266.48
  6. Step 6: Final answer
    x = 601.16

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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.