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Finding the Fourth Proportional to 630,491.20, 945,506.40 and 209,780.80

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Solution

The fourth proportional to 630,491.20, 945,506.40 and 209,780.80 is: 314,594.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,491.20 : 945,506.40 = 209,780.80 : x
  2. Step 2: Convert to fraction form
    630,491.20/945,506.40 = 209,780.80/x
  3. Step 3: Cross multiply
    630,491.20x = 945,506.40 × 209,780.80
  4. Step 4: Simplify right side
    630,491.20x = 198,349,088,997.12
  5. Step 5: Solve for x
    x = 198,349,088,997.12/630,491.20
  6. Step 6: Final answer
    x = 314,594.54

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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.