Home / 420,199.52-630,299.36-139,719.20

Finding the Fourth Proportional to 420,199.52, 630,299.36 and 139,719.20

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Solution

The fourth proportional to 420,199.52, 630,299.36 and 139,719.20 is: 209,578.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,199.52 : 630,299.36 = 139,719.20 : x
  2. Step 2: Convert to fraction form
    420,199.52/630,299.36 = 139,719.20/x
  3. Step 3: Cross multiply
    420,199.52x = 630,299.36 × 139,719.20
  4. Step 4: Simplify right side
    420,199.52x = 88,064,922,339.71
  5. Step 5: Solve for x
    x = 88,064,922,339.71/420,199.52
  6. Step 6: Final answer
    x = 209,578.83

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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.