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Finding the Fourth Proportional to 60,419.98, 90,639.69 and 20,988.37

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Solution

The fourth proportional to 60,419.98, 90,639.69 and 20,988.37 is: 31,485.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,419.98 : 90,639.69 = 20,988.37 : x
  2. Step 2: Convert to fraction form
    60,419.98/90,639.69 = 20,988.37/x
  3. Step 3: Cross multiply
    60,419.98x = 90,639.69 × 20,988.37
  4. Step 4: Simplify right side
    60,419.98x = 1,902,379,350.41
  5. Step 5: Solve for x
    x = 1,902,379,350.41/60,419.98
  6. Step 6: Final answer
    x = 31,485.93

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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.