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Finding the Fourth Proportional to 420,329.84, 630,500.22 and 139,847.09

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Solution

The fourth proportional to 420,329.84, 630,500.22 and 139,847.09 is: 209,772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,329.84 : 630,500.22 = 139,847.09 : x
  2. Step 2: Convert to fraction form
    420,329.84/630,500.22 = 139,847.09/x
  3. Step 3: Cross multiply
    420,329.84x = 630,500.22 × 139,847.09
  4. Step 4: Simplify right side
    420,329.84x = 88,173,617,858.86
  5. Step 5: Solve for x
    x = 88,173,617,858.86/420,329.84
  6. Step 6: Final answer
    x = 209,772.45

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1.5x scale

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.