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Finding the Fourth Proportional to 420,365.10, 579,937.20 and 258,940.20

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Solution

The fourth proportional to 420,365.10, 579,937.20 and 258,940.20 is: 357,234.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,365.10 : 579,937.20 = 258,940.20 : x
  2. Step 2: Convert to fraction form
    420,365.10/579,937.20 = 258,940.20/x
  3. Step 3: Cross multiply
    420,365.10x = 579,937.20 × 258,940.20
  4. Step 4: Simplify right side
    420,365.10x = 150,169,054,555.44
  5. Step 5: Solve for x
    x = 150,169,054,555.44/420,365.10
  6. Step 6: Final answer
    x = 357,234.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.