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Finding the Fourth Proportional to 716,381.06, 988,590.76 and 394,085.30

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Solution

The fourth proportional to 716,381.06, 988,590.76 and 394,085.30 is: 543,829.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,381.06 : 988,590.76 = 394,085.30 : x
  2. Step 2: Convert to fraction form
    716,381.06/988,590.76 = 394,085.30/x
  3. Step 3: Cross multiply
    716,381.06x = 988,590.76 × 394,085.30
  4. Step 4: Simplify right side
    716,381.06x = 389,589,080,303.66
  5. Step 5: Solve for x
    x = 389,589,080,303.66/716,381.06
  6. Step 6: Final answer
    x = 543,829.40

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Double scale
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Similar ratio
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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.