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Finding the Fourth Proportional to 978,056.40, 1,469,417.40 and 875,413.20

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Solution

The fourth proportional to 978,056.40, 1,469,417.40 and 875,413.20 is: 1,315,207.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,056.40 : 1,469,417.40 = 875,413.20 : x
  2. Step 2: Convert to fraction form
    978,056.40/1,469,417.40 = 875,413.20/x
  3. Step 3: Cross multiply
    978,056.40x = 1,469,417.40 × 875,413.20
  4. Step 4: Simplify right side
    978,056.40x = 1,286,347,388,269.68
  5. Step 5: Solve for x
    x = 1,286,347,388,269.68/978,056.40
  6. Step 6: Final answer
    x = 1,315,207.78

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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.