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Finding the Fourth Proportional to 642,472.78, 886,599.21 and 355,990.36

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Solution

The fourth proportional to 642,472.78, 886,599.21 and 355,990.36 is: 491,259.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,472.78 : 886,599.21 = 355,990.36 : x
  2. Step 2: Convert to fraction form
    642,472.78/886,599.21 = 355,990.36/x
  3. Step 3: Cross multiply
    642,472.78x = 886,599.21 × 355,990.36
  4. Step 4: Simplify right side
    642,472.78x = 315,620,771,943.62
  5. Step 5: Solve for x
    x = 315,620,771,943.62/642,472.78
  6. Step 6: Final answer
    x = 491,259.37

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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.