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Finding the Fourth Proportional to 91.00, 125.55 and 51.66

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Solution

The fourth proportional to 91.00, 125.55 and 51.66 is: 71.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.00 : 125.55 = 51.66 : x
  2. Step 2: Convert to fraction form
    91.00/125.55 = 51.66/x
  3. Step 3: Cross multiply
    91.00x = 125.55 × 51.66
  4. Step 4: Simplify right side
    91.00x = 6,485.41
  5. Step 5: Solve for x
    x = 6,485.41/91.00
  6. Step 6: Final answer
    x = 71.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.