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Finding the Fourth Proportional to 686,779.88, 947,436.44 and 445,140.68

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Solution

The fourth proportional to 686,779.88, 947,436.44 and 445,140.68 is: 614,086.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,779.88 : 947,436.44 = 445,140.68 : x
  2. Step 2: Convert to fraction form
    686,779.88/947,436.44 = 445,140.68/x
  3. Step 3: Cross multiply
    686,779.88x = 947,436.44 × 445,140.68
  4. Step 4: Simplify right side
    686,779.88x = 421,742,501,158.38
  5. Step 5: Solve for x
    x = 421,742,501,158.38/686,779.88
  6. Step 6: Final answer
    x = 614,086.86

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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.