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Finding the Fourth Proportional to 420,197.63, 630,301.93 and 139,714.88

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Solution

The fourth proportional to 420,197.63, 630,301.93 and 139,714.88 is: 209,574.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,197.63 : 630,301.93 = 139,714.88 : x
  2. Step 2: Convert to fraction form
    420,197.63/630,301.93 = 139,714.88/x
  3. Step 3: Cross multiply
    420,197.63x = 630,301.93 × 139,714.88
  4. Step 4: Simplify right side
    420,197.63x = 88,062,555,012.92
  5. Step 5: Solve for x
    x = 88,062,555,012.92/420,197.63
  6. Step 6: Final answer
    x = 209,574.14

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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.