Home / 420,640.08-630,965.58-121,125.57

Finding the Fourth Proportional to 420,640.08, 630,965.58 and 121,125.57

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Solution

The fourth proportional to 420,640.08, 630,965.58 and 121,125.57 is: 181,689.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,640.08 : 630,965.58 = 121,125.57 : x
  2. Step 2: Convert to fraction form
    420,640.08/630,965.58 = 121,125.57/x
  3. Step 3: Cross multiply
    420,640.08x = 630,965.58 × 121,125.57
  4. Step 4: Simplify right side
    420,640.08x = 76,426,065,527.88
  5. Step 5: Solve for x
    x = 76,426,065,527.88/420,640.08
  6. Step 6: Final answer
    x = 181,689.93

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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.