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Finding the Fourth Proportional to 716,051.59, 987,909.32 and 405,920.90

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Solution

The fourth proportional to 716,051.59, 987,909.32 and 405,920.90 is: 560,033.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,051.59 : 987,909.32 = 405,920.90 : x
  2. Step 2: Convert to fraction form
    716,051.59/987,909.32 = 405,920.90/x
  3. Step 3: Cross multiply
    716,051.59x = 987,909.32 × 405,920.90
  4. Step 4: Simplify right side
    716,051.59x = 401,013,043,777.36
  5. Step 5: Solve for x
    x = 401,013,043,777.36/716,051.59
  6. Step 6: Final answer
    x = 560,033.73

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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.