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Finding the Fourth Proportional to 91,171, 125,820.90 and 53,457.40

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Solution

The fourth proportional to 91,171, 125,820.90 and 53,457.40 is: 73,774.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,171 : 125,820.90 = 53,457.40 : x
  2. Step 2: Convert to fraction form
    91,171/125,820.90 = 53,457.40/x
  3. Step 3: Cross multiply
    91,171x = 125,820.90 × 53,457.40
  4. Step 4: Simplify right side
    91,171x = 6,726,058,179.66
  5. Step 5: Solve for x
    x = 6,726,058,179.66/91,171
  6. Step 6: Final answer
    x = 73,774.10

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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.