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Finding the Fourth Proportional to 425,971.20, 638,956.80 and 163,315.20

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Solution

The fourth proportional to 425,971.20, 638,956.80 and 163,315.20 is: 244,972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,971.20 : 638,956.80 = 163,315.20 : x
  2. Step 2: Convert to fraction form
    425,971.20/638,956.80 = 163,315.20/x
  3. Step 3: Cross multiply
    425,971.20x = 638,956.80 × 163,315.20
  4. Step 4: Simplify right side
    425,971.20x = 104,351,357,583.36
  5. Step 5: Solve for x
    x = 104,351,357,583.36/425,971.20
  6. Step 6: Final answer
    x = 244,972.80

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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.