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Finding the Fourth Proportional to 420,172.80, 630,290.88 and 120,651.12

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Solution

The fourth proportional to 420,172.80, 630,290.88 and 120,651.12 is: 180,985.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,172.80 : 630,290.88 = 120,651.12 : x
  2. Step 2: Convert to fraction form
    420,172.80/630,290.88 = 120,651.12/x
  3. Step 3: Cross multiply
    420,172.80x = 630,290.88 × 120,651.12
  4. Step 4: Simplify right side
    420,172.80x = 76,045,300,597.79
  5. Step 5: Solve for x
    x = 76,045,300,597.79/420,172.80
  6. Step 6: Final answer
    x = 180,985.78

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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.