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Finding the Fourth Proportional to 108,359.21, 149,559.05 and 65,931.41

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Solution

The fourth proportional to 108,359.21, 149,559.05 and 65,931.41 is: 90,999.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,359.21 : 149,559.05 = 65,931.41 : x
  2. Step 2: Convert to fraction form
    108,359.21/149,559.05 = 65,931.41/x
  3. Step 3: Cross multiply
    108,359.21x = 149,559.05 × 65,931.41
  4. Step 4: Simplify right side
    108,359.21x = 9,860,639,583.49
  5. Step 5: Solve for x
    x = 9,860,639,583.49/108,359.21
  6. Step 6: Final answer
    x = 90,999.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.