Home / 420,588.63-630,982.40-136,278.71

Finding the Fourth Proportional to 420,588.63, 630,982.40 and 136,278.71

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Solution

The fourth proportional to 420,588.63, 630,982.40 and 136,278.71 is: 204,450.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,588.63 : 630,982.40 = 136,278.71 : x
  2. Step 2: Convert to fraction form
    420,588.63/630,982.40 = 136,278.71/x
  3. Step 3: Cross multiply
    420,588.63x = 630,982.40 × 136,278.71
  4. Step 4: Simplify right side
    420,588.63x = 85,989,463,668.40
  5. Step 5: Solve for x
    x = 85,989,463,668.40/420,588.63
  6. Step 6: Final answer
    x = 204,450.28

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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.