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Finding the Fourth Proportional to 72,693.89, 100,317.03 and 40,428.81

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Solution

The fourth proportional to 72,693.89, 100,317.03 and 40,428.81 is: 55,791.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,693.89 : 100,317.03 = 40,428.81 : x
  2. Step 2: Convert to fraction form
    72,693.89/100,317.03 = 40,428.81/x
  3. Step 3: Cross multiply
    72,693.89x = 100,317.03 × 40,428.81
  4. Step 4: Simplify right side
    72,693.89x = 4,055,698,145.63
  5. Step 5: Solve for x
    x = 4,055,698,145.63/72,693.89
  6. Step 6: Final answer
    x = 55,791.46

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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.