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Finding the Fourth Proportional to 72,744.18, 100,379.86 and 40,912.39

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Solution

The fourth proportional to 72,744.18, 100,379.86 and 40,912.39 is: 56,455.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,744.18 : 100,379.86 = 40,912.39 : x
  2. Step 2: Convert to fraction form
    72,744.18/100,379.86 = 40,912.39/x
  3. Step 3: Cross multiply
    72,744.18x = 100,379.86 × 40,912.39
  4. Step 4: Simplify right side
    72,744.18x = 4,106,779,980.47
  5. Step 5: Solve for x
    x = 4,106,779,980.47/72,744.18
  6. Step 6: Final answer
    x = 56,455.10

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1.5x scale

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.