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Finding the Fourth Proportional to 714,116.62, 985,490.04 and 391,820.86

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Solution

The fourth proportional to 714,116.62, 985,490.04 and 391,820.86 is: 540,717.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,116.62 : 985,490.04 = 391,820.86 : x
  2. Step 2: Convert to fraction form
    714,116.62/985,490.04 = 391,820.86/x
  3. Step 3: Cross multiply
    714,116.62x = 985,490.04 × 391,820.86
  4. Step 4: Simplify right side
    714,116.62x = 386,135,554,994.23
  5. Step 5: Solve for x
    x = 386,135,554,994.23/714,116.62
  6. Step 6: Final answer
    x = 540,717.78

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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.