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Finding the Fourth Proportional to 1,118.70, 1,677.63 and 425

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Solution

The fourth proportional to 1,118.70, 1,677.63 and 425 is: 637.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.70 : 1,677.63 = 425 : x
  2. Step 2: Convert to fraction form
    1,118.70/1,677.63 = 425/x
  3. Step 3: Cross multiply
    1,118.70x = 1,677.63 × 425
  4. Step 4: Simplify right side
    1,118.70x = 712,992.75
  5. Step 5: Solve for x
    x = 712,992.75/1,118.70
  6. Step 6: Final answer
    x = 637.34

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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.