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Finding the Fourth Proportional to 1,118.80, 1,679.01 and 388.99

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Solution

The fourth proportional to 1,118.80, 1,679.01 and 388.99 is: 583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.80 : 1,679.01 = 388.99 : x
  2. Step 2: Convert to fraction form
    1,118.80/1,679.01 = 388.99/x
  3. Step 3: Cross multiply
    1,118.80x = 1,679.01 × 388.99
  4. Step 4: Simplify right side
    1,118.80x = 653,118.10
  5. Step 5: Solve for x
    x = 653,118.10/1,118.80
  6. Step 6: Final answer
    x = 583.77

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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.