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Finding the Fourth Proportional to 405,635.40, 608,510.70 and 125,123.40

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Solution

The fourth proportional to 405,635.40, 608,510.70 and 125,123.40 is: 187,702.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,635.40 : 608,510.70 = 125,123.40 : x
  2. Step 2: Convert to fraction form
    405,635.40/608,510.70 = 125,123.40/x
  3. Step 3: Cross multiply
    405,635.40x = 608,510.70 × 125,123.40
  4. Step 4: Simplify right side
    405,635.40x = 76,138,927,720.38
  5. Step 5: Solve for x
    x = 76,138,927,720.38/405,635.40
  6. Step 6: Final answer
    x = 187,702.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.