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Finding the Fourth Proportional to 420,100.20, 630,189.54 and 167,319.72

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Solution

The fourth proportional to 420,100.20, 630,189.54 and 167,319.72 is: 250,995.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,100.20 : 630,189.54 = 167,319.72 : x
  2. Step 2: Convert to fraction form
    420,100.20/630,189.54 = 167,319.72/x
  3. Step 3: Cross multiply
    420,100.20x = 630,189.54 × 167,319.72
  4. Step 4: Simplify right side
    420,100.20x = 105,443,137,379.73
  5. Step 5: Solve for x
    x = 105,443,137,379.73/420,100.20
  6. Step 6: Final answer
    x = 250,995.21

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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.