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Finding the Fourth Proportional to 55.87, 77.10 and 31.31

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Solution

The fourth proportional to 55.87, 77.10 and 31.31 is: 43.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.87 : 77.10 = 31.31 : x
  2. Step 2: Convert to fraction form
    55.87/77.10 = 31.31/x
  3. Step 3: Cross multiply
    55.87x = 77.10 × 31.31
  4. Step 4: Simplify right side
    55.87x = 2,413.50
  5. Step 5: Solve for x
    x = 2,413.50/55.87
  6. Step 6: Final answer
    x = 43.20

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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.