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Finding the Fourth Proportional to 108,989.40, 163,613.70 and 61,642.20

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Solution

The fourth proportional to 108,989.40, 163,613.70 and 61,642.20 is: 92,536.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,989.40 : 163,613.70 = 61,642.20 : x
  2. Step 2: Convert to fraction form
    108,989.40/163,613.70 = 61,642.20/x
  3. Step 3: Cross multiply
    108,989.40x = 163,613.70 × 61,642.20
  4. Step 4: Simplify right side
    108,989.40x = 10,085,508,418.14
  5. Step 5: Solve for x
    x = 10,085,508,418.14/108,989.40
  6. Step 6: Final answer
    x = 92,536.60

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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.