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Finding the Fourth Proportional to 1,118.21, 1,677.00 and 387.59

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Solution

The fourth proportional to 1,118.21, 1,677.00 and 387.59 is: 581.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.21 : 1,677.00 = 387.59 : x
  2. Step 2: Convert to fraction form
    1,118.21/1,677.00 = 387.59/x
  3. Step 3: Cross multiply
    1,118.21x = 1,677.00 × 387.59
  4. Step 4: Simplify right side
    1,118.21x = 649,981.50
  5. Step 5: Solve for x
    x = 649,981.50/1,118.21
  6. Step 6: Final answer
    x = 581.27

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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.