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Finding the Fourth Proportional to 91,223.44, 136,835.10 and 66,421.30

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Solution

The fourth proportional to 91,223.44, 136,835.10 and 66,421.30 is: 99,631.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,223.44 : 136,835.10 = 66,421.30 : x
  2. Step 2: Convert to fraction form
    91,223.44/136,835.10 = 66,421.30/x
  3. Step 3: Cross multiply
    91,223.44x = 136,835.10 × 66,421.30
  4. Step 4: Simplify right side
    91,223.44x = 9,088,765,227.63
  5. Step 5: Solve for x
    x = 9,088,765,227.63/91,223.44
  6. Step 6: Final answer
    x = 99,631.91

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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.