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Finding the Fourth Proportional to 83.90, 125.83 and 56.45

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Solution

The fourth proportional to 83.90, 125.83 and 56.45 is: 84.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.90 : 125.83 = 56.45 : x
  2. Step 2: Convert to fraction form
    83.90/125.83 = 56.45/x
  3. Step 3: Cross multiply
    83.90x = 125.83 × 56.45
  4. Step 4: Simplify right side
    83.90x = 7,103.10
  5. Step 5: Solve for x
    x = 7,103.10/83.90
  6. Step 6: Final answer
    x = 84.66

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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.