Home / 420,208.25-630,317.85-139,725.50

Finding the Fourth Proportional to 420,208.25, 630,317.85 and 139,725.50

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Solution

The fourth proportional to 420,208.25, 630,317.85 and 139,725.50 is: 209,590.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,208.25 : 630,317.85 = 139,725.50 : x
  2. Step 2: Convert to fraction form
    420,208.25/630,317.85 = 139,725.50/x
  3. Step 3: Cross multiply
    420,208.25x = 630,317.85 × 139,725.50
  4. Step 4: Simplify right side
    420,208.25x = 88,071,476,051.55
  5. Step 5: Solve for x
    x = 88,071,476,051.55/420,208.25
  6. Step 6: Final answer
    x = 209,590.07

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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.