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Finding the Fourth Proportional to 85,413.40, 128,120.10 and 84,101.20

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Solution

The fourth proportional to 85,413.40, 128,120.10 and 84,101.20 is: 126,151.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,413.40 : 128,120.10 = 84,101.20 : x
  2. Step 2: Convert to fraction form
    85,413.40/128,120.10 = 84,101.20/x
  3. Step 3: Cross multiply
    85,413.40x = 128,120.10 × 84,101.20
  4. Step 4: Simplify right side
    85,413.40x = 10,775,054,154.12
  5. Step 5: Solve for x
    x = 10,775,054,154.12/85,413.40
  6. Step 6: Final answer
    x = 126,151.80

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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.