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Finding the Fourth Proportional to 318,413.60, 477,620.40 and 212,125.40

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Solution

The fourth proportional to 318,413.60, 477,620.40 and 212,125.40 is: 318,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,413.60 : 477,620.40 = 212,125.40 : x
  2. Step 2: Convert to fraction form
    318,413.60/477,620.40 = 212,125.40/x
  3. Step 3: Cross multiply
    318,413.60x = 477,620.40 × 212,125.40
  4. Step 4: Simplify right side
    318,413.60x = 101,315,418,398.16
  5. Step 5: Solve for x
    x = 101,315,418,398.16/318,413.60
  6. Step 6: Final answer
    x = 318,188.10

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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.