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Finding the Fourth Proportional to 718,145.88, 991,041.06 and 395,861.34

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Solution

The fourth proportional to 718,145.88, 991,041.06 and 395,861.34 is: 546,288.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,145.88 : 991,041.06 = 395,861.34 : x
  2. Step 2: Convert to fraction form
    718,145.88/991,041.06 = 395,861.34/x
  3. Step 3: Cross multiply
    718,145.88x = 991,041.06 × 395,861.34
  4. Step 4: Simplify right side
    718,145.88x = 392,314,842,006.62
  5. Step 5: Solve for x
    x = 392,314,842,006.62/718,145.88
  6. Step 6: Final answer
    x = 546,288.51

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Double scale
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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.