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Finding the Fourth Proportional to 420,144.70, 630,217.05 and 325,666.30

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Solution

The fourth proportional to 420,144.70, 630,217.05 and 325,666.30 is: 488,499.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,144.70 : 630,217.05 = 325,666.30 : x
  2. Step 2: Convert to fraction form
    420,144.70/630,217.05 = 325,666.30/x
  3. Step 3: Cross multiply
    420,144.70x = 630,217.05 × 325,666.30
  4. Step 4: Simplify right side
    420,144.70x = 205,240,454,870.42
  5. Step 5: Solve for x
    x = 205,240,454,870.42/420,144.70
  6. Step 6: Final answer
    x = 488,499.45

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Similar ratio
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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.