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Finding the Fourth Proportional to 81,056, 121,484.16 and 57,555.20

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Solution

The fourth proportional to 81,056, 121,484.16 and 57,555.20 is: 86,261.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,056 : 121,484.16 = 57,555.20 : x
  2. Step 2: Convert to fraction form
    81,056/121,484.16 = 57,555.20/x
  3. Step 3: Cross multiply
    81,056x = 121,484.16 × 57,555.20
  4. Step 4: Simplify right side
    81,056x = 6,992,045,125.63
  5. Step 5: Solve for x
    x = 6,992,045,125.63/81,056
  6. Step 6: Final answer
    x = 86,261.91

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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.