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Finding the Fourth Proportional to 72,970.54, 100,699.42 and 39,436.54

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Solution

The fourth proportional to 72,970.54, 100,699.42 and 39,436.54 is: 54,422.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,970.54 : 100,699.42 = 39,436.54 : x
  2. Step 2: Convert to fraction form
    72,970.54/100,699.42 = 39,436.54/x
  3. Step 3: Cross multiply
    72,970.54x = 100,699.42 × 39,436.54
  4. Step 4: Simplify right side
    72,970.54x = 3,971,236,704.81
  5. Step 5: Solve for x
    x = 3,971,236,704.81/72,970.54
  6. Step 6: Final answer
    x = 54,422.47

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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.