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Finding the Fourth Proportional to 420,636.51, 630,429.89 and 210,334.59

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Solution

The fourth proportional to 420,636.51, 630,429.89 and 210,334.59 is: 315,239.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,636.51 : 630,429.89 = 210,334.59 : x
  2. Step 2: Convert to fraction form
    420,636.51/630,429.89 = 210,334.59/x
  3. Step 3: Cross multiply
    420,636.51x = 630,429.89 × 210,334.59
  4. Step 4: Simplify right side
    420,636.51x = 132,601,211,385.22
  5. Step 5: Solve for x
    x = 132,601,211,385.22/420,636.51
  6. Step 6: Final answer
    x = 315,239.42

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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.