Home / 81,129.12-121,739.48-43,688.40

Finding the Fourth Proportional to 81,129.12, 121,739.48 and 43,688.40

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Solution

The fourth proportional to 81,129.12, 121,739.48 and 43,688.40 is: 65,557.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,129.12 : 121,739.48 = 43,688.40 : x
  2. Step 2: Convert to fraction form
    81,129.12/121,739.48 = 43,688.40/x
  3. Step 3: Cross multiply
    81,129.12x = 121,739.48 × 43,688.40
  4. Step 4: Simplify right side
    81,129.12x = 5,318,603,098.03
  5. Step 5: Solve for x
    x = 5,318,603,098.03/81,129.12
  6. Step 6: Final answer
    x = 65,557.26

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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.