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Finding the Fourth Proportional to 91,188, 136,669.68 and 64,749.60

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Solution

The fourth proportional to 91,188, 136,669.68 and 64,749.60 is: 97,044.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,188 : 136,669.68 = 64,749.60 : x
  2. Step 2: Convert to fraction form
    91,188/136,669.68 = 64,749.60/x
  3. Step 3: Cross multiply
    91,188x = 136,669.68 × 64,749.60
  4. Step 4: Simplify right side
    91,188x = 8,849,307,112.13
  5. Step 5: Solve for x
    x = 8,849,307,112.13/91,188
  6. Step 6: Final answer
    x = 97,044.65

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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.