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Finding the Fourth Proportional to 515,779.83, 711,887.58 and 393,589.71

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Solution

The fourth proportional to 515,779.83, 711,887.58 and 393,589.71 is: 543,238.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,779.83 : 711,887.58 = 393,589.71 : x
  2. Step 2: Convert to fraction form
    515,779.83/711,887.58 = 393,589.71/x
  3. Step 3: Cross multiply
    515,779.83x = 711,887.58 × 393,589.71
  4. Step 4: Simplify right side
    515,779.83x = 280,191,626,164.80
  5. Step 5: Solve for x
    x = 280,191,626,164.80/515,779.83
  6. Step 6: Final answer
    x = 543,238.82

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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.