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Finding the Fourth Proportional to 1,408.68, 2,111.76 and 888.30

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Solution

The fourth proportional to 1,408.68, 2,111.76 and 888.30 is: 1,331.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.68 : 2,111.76 = 888.30 : x
  2. Step 2: Convert to fraction form
    1,408.68/2,111.76 = 888.30/x
  3. Step 3: Cross multiply
    1,408.68x = 2,111.76 × 888.30
  4. Step 4: Simplify right side
    1,408.68x = 1,875,876.41
  5. Step 5: Solve for x
    x = 1,875,876.41/1,408.68
  6. Step 6: Final answer
    x = 1,331.66

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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.