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Finding the Fourth Proportional to 420,516.50, 630,871.35 and 120,999.56

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Solution

The fourth proportional to 420,516.50, 630,871.35 and 120,999.56 is: 181,527.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,516.50 : 630,871.35 = 120,999.56 : x
  2. Step 2: Convert to fraction form
    420,516.50/630,871.35 = 120,999.56/x
  3. Step 3: Cross multiply
    420,516.50x = 630,871.35 × 120,999.56
  4. Step 4: Simplify right side
    420,516.50x = 76,335,152,158.50
  5. Step 5: Solve for x
    x = 76,335,152,158.50/420,516.50
  6. Step 6: Final answer
    x = 181,527.13

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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.