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Finding the Fourth Proportional to 81,489.89, 112,455.69 and 45,679.91

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Solution

The fourth proportional to 81,489.89, 112,455.69 and 45,679.91 is: 63,038.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,489.89 : 112,455.69 = 45,679.91 : x
  2. Step 2: Convert to fraction form
    81,489.89/112,455.69 = 45,679.91/x
  3. Step 3: Cross multiply
    81,489.89x = 112,455.69 × 45,679.91
  4. Step 4: Simplify right side
    81,489.89x = 5,136,965,798.19
  5. Step 5: Solve for x
    x = 5,136,965,798.19/81,489.89
  6. Step 6: Final answer
    x = 63,038.08

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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.