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Finding the Fourth Proportional to 91,116.78, 136,539.09 and 74,592.78

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Solution

The fourth proportional to 91,116.78, 136,539.09 and 74,592.78 is: 111,777.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,116.78 : 136,539.09 = 74,592.78 : x
  2. Step 2: Convert to fraction form
    91,116.78/136,539.09 = 74,592.78/x
  3. Step 3: Cross multiply
    91,116.78x = 136,539.09 × 74,592.78
  4. Step 4: Simplify right side
    91,116.78x = 10,184,830,301.77
  5. Step 5: Solve for x
    x = 10,184,830,301.77/91,116.78
  6. Step 6: Final answer
    x = 111,777.77

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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.