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Finding the Fourth Proportional to 420,648.55, 630,840.45 and 136,273.12

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Solution

The fourth proportional to 420,648.55, 630,840.45 and 136,273.12 is: 204,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,648.55 : 630,840.45 = 136,273.12 : x
  2. Step 2: Convert to fraction form
    420,648.55/630,840.45 = 136,273.12/x
  3. Step 3: Cross multiply
    420,648.55x = 630,840.45 × 136,273.12
  4. Step 4: Simplify right side
    420,648.55x = 85,966,596,343.70
  5. Step 5: Solve for x
    x = 85,966,596,343.70/420,648.55
  6. Step 6: Final answer
    x = 204,366.80

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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.