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Finding the Fourth Proportional to 72,881.68, 109,445.40 and 69,140.56

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Solution

The fourth proportional to 72,881.68, 109,445.40 and 69,140.56 is: 103,827.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,881.68 : 109,445.40 = 69,140.56 : x
  2. Step 2: Convert to fraction form
    72,881.68/109,445.40 = 69,140.56/x
  3. Step 3: Cross multiply
    72,881.68x = 109,445.40 × 69,140.56
  4. Step 4: Simplify right side
    72,881.68x = 7,567,116,245.42
  5. Step 5: Solve for x
    x = 7,567,116,245.42/72,881.68
  6. Step 6: Final answer
    x = 103,827.41

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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.