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Finding the Fourth Proportional to 713,812.77, 985,089.20 and 391,536.45

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Solution

The fourth proportional to 713,812.77, 985,089.20 and 391,536.45 is: 540,335.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,812.77 : 985,089.20 = 391,536.45 : x
  2. Step 2: Convert to fraction form
    713,812.77/985,089.20 = 391,536.45/x
  3. Step 3: Cross multiply
    713,812.77x = 985,089.20 × 391,536.45
  4. Step 4: Simplify right side
    713,812.77x = 385,698,326,343.66
  5. Step 5: Solve for x
    x = 385,698,326,343.66/713,812.77
  6. Step 6: Final answer
    x = 540,335.42

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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.