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Finding the Fourth Proportional to 338,413.20, 507,389.40 and 128,019.60

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Solution

The fourth proportional to 338,413.20, 507,389.40 and 128,019.60 is: 191,942.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,413.20 : 507,389.40 = 128,019.60 : x
  2. Step 2: Convert to fraction form
    338,413.20/507,389.40 = 128,019.60/x
  3. Step 3: Cross multiply
    338,413.20x = 507,389.40 × 128,019.60
  4. Step 4: Simplify right side
    338,413.20x = 64,955,788,032.24
  5. Step 5: Solve for x
    x = 64,955,788,032.24/338,413.20
  6. Step 6: Final answer
    x = 191,942.24

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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.