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Finding the Fourth Proportional to 57,129.48, 78,840 and 33,260.40

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Solution

The fourth proportional to 57,129.48, 78,840 and 33,260.40 is: 45,900.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,129.48 : 78,840 = 33,260.40 : x
  2. Step 2: Convert to fraction form
    57,129.48/78,840 = 33,260.40/x
  3. Step 3: Cross multiply
    57,129.48x = 78,840 × 33,260.40
  4. Step 4: Simplify right side
    57,129.48x = 2,622,249,936
  5. Step 5: Solve for x
    x = 2,622,249,936/57,129.48
  6. Step 6: Final answer
    x = 45,900.12

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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.