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Finding the Fourth Proportional to 642,216.80, 963,325.20 and 393,384.80

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Solution

The fourth proportional to 642,216.80, 963,325.20 and 393,384.80 is: 590,077.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,216.80 : 963,325.20 = 393,384.80 : x
  2. Step 2: Convert to fraction form
    642,216.80/963,325.20 = 393,384.80/x
  3. Step 3: Cross multiply
    642,216.80x = 963,325.20 × 393,384.80
  4. Step 4: Simplify right side
    642,216.80x = 378,957,491,136.96
  5. Step 5: Solve for x
    x = 378,957,491,136.96/642,216.80
  6. Step 6: Final answer
    x = 590,077.20

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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.