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Finding the Fourth Proportional to 393,609.20, 590,413.80 and 156,988.40

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Solution

The fourth proportional to 393,609.20, 590,413.80 and 156,988.40 is: 235,482.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,609.20 : 590,413.80 = 156,988.40 : x
  2. Step 2: Convert to fraction form
    393,609.20/590,413.80 = 156,988.40/x
  3. Step 3: Cross multiply
    393,609.20x = 590,413.80 × 156,988.40
  4. Step 4: Simplify right side
    393,609.20x = 92,688,117,799.92
  5. Step 5: Solve for x
    x = 92,688,117,799.92/393,609.20
  6. Step 6: Final answer
    x = 235,482.60

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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.