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Finding the Fourth Proportional to 445,435.20, 668,305.80 and 129,938.40

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Solution

The fourth proportional to 445,435.20, 668,305.80 and 129,938.40 is: 194,952.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,435.20 : 668,305.80 = 129,938.40 : x
  2. Step 2: Convert to fraction form
    445,435.20/668,305.80 = 129,938.40/x
  3. Step 3: Cross multiply
    445,435.20x = 668,305.80 × 129,938.40
  4. Step 4: Simplify right side
    445,435.20x = 86,838,586,362.72
  5. Step 5: Solve for x
    x = 86,838,586,362.72/445,435.20
  6. Step 6: Final answer
    x = 194,952.23

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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.