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Finding the Fourth Proportional to 108,135.40, 162,203.10 and 78,413.80

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Solution

The fourth proportional to 108,135.40, 162,203.10 and 78,413.80 is: 117,620.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,135.40 : 162,203.10 = 78,413.80 : x
  2. Step 2: Convert to fraction form
    108,135.40/162,203.10 = 78,413.80/x
  3. Step 3: Cross multiply
    108,135.40x = 162,203.10 × 78,413.80
  4. Step 4: Simplify right side
    108,135.40x = 12,718,961,442.78
  5. Step 5: Solve for x
    x = 12,718,961,442.78/108,135.40
  6. Step 6: Final answer
    x = 117,620.70

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1.5x scale

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.