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Finding the Fourth Proportional to 718,189.72, 991,108.55 and 395,911.35

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Solution

The fourth proportional to 718,189.72, 991,108.55 and 395,911.35 is: 546,361.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,189.72 : 991,108.55 = 395,911.35 : x
  2. Step 2: Convert to fraction form
    718,189.72/991,108.55 = 395,911.35/x
  3. Step 3: Cross multiply
    718,189.72x = 991,108.55 × 395,911.35
  4. Step 4: Simplify right side
    718,189.72x = 392,391,125,016.82
  5. Step 5: Solve for x
    x = 392,391,125,016.82/718,189.72
  6. Step 6: Final answer
    x = 546,361.38

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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.