Home / 420,590.63-630,985.40-136,280.71

Finding the Fourth Proportional to 420,590.63, 630,985.40 and 136,280.71

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Solution

The fourth proportional to 420,590.63, 630,985.40 and 136,280.71 is: 204,453.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,590.63 : 630,985.40 = 136,280.71 : x
  2. Step 2: Convert to fraction form
    420,590.63/630,985.40 = 136,280.71/x
  3. Step 3: Cross multiply
    420,590.63x = 630,985.40 × 136,280.71
  4. Step 4: Simplify right side
    420,590.63x = 85,991,138,311.63
  5. Step 5: Solve for x
    x = 85,991,138,311.63/420,590.63
  6. Step 6: Final answer
    x = 204,453.29

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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.