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Finding the Fourth Proportional to 91,212, 136,705.68 and 64,773.60

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Solution

The fourth proportional to 91,212, 136,705.68 and 64,773.60 is: 97,080.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212 : 136,705.68 = 64,773.60 : x
  2. Step 2: Convert to fraction form
    91,212/136,705.68 = 64,773.60/x
  3. Step 3: Cross multiply
    91,212x = 136,705.68 × 64,773.60
  4. Step 4: Simplify right side
    91,212x = 8,854,919,034.05
  5. Step 5: Solve for x
    x = 8,854,919,034.05/91,212
  6. Step 6: Final answer
    x = 97,080.64

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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.