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Finding the Fourth Proportional to 90.63, 125.06 and 51.29

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Solution

The fourth proportional to 90.63, 125.06 and 51.29 is: 70.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.63 : 125.06 = 51.29 : x
  2. Step 2: Convert to fraction form
    90.63/125.06 = 51.29/x
  3. Step 3: Cross multiply
    90.63x = 125.06 × 51.29
  4. Step 4: Simplify right side
    90.63x = 6,413.87
  5. Step 5: Solve for x
    x = 6,413.87/90.63
  6. Step 6: Final answer
    x = 70.77

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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.