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Finding the Fourth Proportional to 425,410.20, 638,115.30 and 389,980.80

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Solution

The fourth proportional to 425,410.20, 638,115.30 and 389,980.80 is: 584,971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,410.20 : 638,115.30 = 389,980.80 : x
  2. Step 2: Convert to fraction form
    425,410.20/638,115.30 = 389,980.80/x
  3. Step 3: Cross multiply
    425,410.20x = 638,115.30 × 389,980.80
  4. Step 4: Simplify right side
    425,410.20x = 248,852,715,186.24
  5. Step 5: Solve for x
    x = 248,852,715,186.24/425,410.20
  6. Step 6: Final answer
    x = 584,971.20

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Similar ratio
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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.