Home / 420,198-630,302.49-139,715.25

Finding the Fourth Proportional to 420,198, 630,302.49 and 139,715.25

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Solution

The fourth proportional to 420,198, 630,302.49 and 139,715.25 is: 209,574.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,198 : 630,302.49 = 139,715.25 : x
  2. Step 2: Convert to fraction form
    420,198/630,302.49 = 139,715.25/x
  3. Step 3: Cross multiply
    420,198x = 630,302.49 × 139,715.25
  4. Step 4: Simplify right side
    420,198x = 88,062,869,965.97
  5. Step 5: Solve for x
    x = 88,062,869,965.97/420,198
  6. Step 6: Final answer
    x = 209,574.70

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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.