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Finding the Fourth Proportional to 420,542.55, 580,328.45 and 239,237.42

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Solution

The fourth proportional to 420,542.55, 580,328.45 and 239,237.42 is: 330,136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,542.55 : 580,328.45 = 239,237.42 : x
  2. Step 2: Convert to fraction form
    420,542.55/580,328.45 = 239,237.42/x
  3. Step 3: Cross multiply
    420,542.55x = 580,328.45 × 239,237.42
  4. Step 4: Simplify right side
    420,542.55x = 138,836,277,929.91
  5. Step 5: Solve for x
    x = 138,836,277,929.91/420,542.55
  6. Step 6: Final answer
    x = 330,136.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.