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Finding the Fourth Proportional to 715,078.13, 986,807.81 and 392,793.60

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Solution

The fourth proportional to 715,078.13, 986,807.81 and 392,793.60 is: 542,055.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,078.13 : 986,807.81 = 392,793.60 : x
  2. Step 2: Convert to fraction form
    715,078.13/986,807.81 = 392,793.60/x
  3. Step 3: Cross multiply
    715,078.13x = 986,807.81 × 392,793.60
  4. Step 4: Simplify right side
    715,078.13x = 387,611,796,880.53
  5. Step 5: Solve for x
    x = 387,611,796,880.53/715,078.13
  6. Step 6: Final answer
    x = 542,055.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.