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Finding the Fourth Proportional to 72,140.80, 99,539.20 and 42,316.80

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Solution

The fourth proportional to 72,140.80, 99,539.20 and 42,316.80 is: 58,388.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,140.80 : 99,539.20 = 42,316.80 : x
  2. Step 2: Convert to fraction form
    72,140.80/99,539.20 = 42,316.80/x
  3. Step 3: Cross multiply
    72,140.80x = 99,539.20 × 42,316.80
  4. Step 4: Simplify right side
    72,140.80x = 4,212,180,418.56
  5. Step 5: Solve for x
    x = 4,212,180,418.56/72,140.80
  6. Step 6: Final answer
    x = 58,388.32

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.