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Finding the Fourth Proportional to 91,668.21, 137,712.84 and 64,712.53

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Solution

The fourth proportional to 91,668.21, 137,712.84 and 64,712.53 is: 97,217.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,668.21 : 137,712.84 = 64,712.53 : x
  2. Step 2: Convert to fraction form
    91,668.21/137,712.84 = 64,712.53/x
  3. Step 3: Cross multiply
    91,668.21x = 137,712.84 × 64,712.53
  4. Step 4: Simplify right side
    91,668.21x = 8,911,745,945.60
  5. Step 5: Solve for x
    x = 8,911,745,945.60/91,668.21
  6. Step 6: Final answer
    x = 97,217.41

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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.