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Finding the Fourth Proportional to 108,986.40, 163,503.90 and 85,366.80

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Solution

The fourth proportional to 108,986.40, 163,503.90 and 85,366.80 is: 128,069.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,986.40 : 163,503.90 = 85,366.80 : x
  2. Step 2: Convert to fraction form
    108,986.40/163,503.90 = 85,366.80/x
  3. Step 3: Cross multiply
    108,986.40x = 163,503.90 × 85,366.80
  4. Step 4: Simplify right side
    108,986.40x = 13,957,804,730.52
  5. Step 5: Solve for x
    x = 13,957,804,730.52/108,986.40
  6. Step 6: Final answer
    x = 128,069.23

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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.