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Finding the Fourth Proportional to 128,413.70, 192,620.55 and 65,428.10

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Solution

The fourth proportional to 128,413.70, 192,620.55 and 65,428.10 is: 98,142.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,413.70 : 192,620.55 = 65,428.10 : x
  2. Step 2: Convert to fraction form
    128,413.70/192,620.55 = 65,428.10/x
  3. Step 3: Cross multiply
    128,413.70x = 192,620.55 × 65,428.10
  4. Step 4: Simplify right side
    128,413.70x = 12,602,796,607.46
  5. Step 5: Solve for x
    x = 12,602,796,607.46/128,413.70
  6. Step 6: Final answer
    x = 98,142.15

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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.