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Finding the Fourth Proportional to 1,118.61, 1,677.93 and 388.21

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Solution

The fourth proportional to 1,118.61, 1,677.93 and 388.21 is: 582.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.61 : 1,677.93 = 388.21 : x
  2. Step 2: Convert to fraction form
    1,118.61/1,677.93 = 388.21/x
  3. Step 3: Cross multiply
    1,118.61x = 1,677.93 × 388.21
  4. Step 4: Simplify right side
    1,118.61x = 651,389.21
  5. Step 5: Solve for x
    x = 651,389.21/1,118.61
  6. Step 6: Final answer
    x = 582.32

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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.