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Finding the Fourth Proportional to 108,387.69, 149,615.13 and 81,607.87

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Solution

The fourth proportional to 108,387.69, 149,615.13 and 81,607.87 is: 112,649.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,387.69 : 149,615.13 = 81,607.87 : x
  2. Step 2: Convert to fraction form
    108,387.69/149,615.13 = 81,607.87/x
  3. Step 3: Cross multiply
    108,387.69x = 149,615.13 × 81,607.87
  4. Step 4: Simplify right side
    108,387.69x = 12,209,772,079.07
  5. Step 5: Solve for x
    x = 12,209,772,079.07/108,387.69
  6. Step 6: Final answer
    x = 112,649.07

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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.