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Finding the Fourth Proportional to 425,660.80, 638,577.60 and 145,206.40

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Solution

The fourth proportional to 425,660.80, 638,577.60 and 145,206.40 is: 217,839.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,660.80 : 638,577.60 = 145,206.40 : x
  2. Step 2: Convert to fraction form
    425,660.80/638,577.60 = 145,206.40/x
  3. Step 3: Cross multiply
    425,660.80x = 638,577.60 × 145,206.40
  4. Step 4: Simplify right side
    425,660.80x = 92,725,554,416.64
  5. Step 5: Solve for x
    x = 92,725,554,416.64/425,660.80
  6. Step 6: Final answer
    x = 217,839.07

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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.