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Finding the Fourth Proportional to 837.99, 1,255.36 and 405.45

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Solution

The fourth proportional to 837.99, 1,255.36 and 405.45 is: 607.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.99 : 1,255.36 = 405.45 : x
  2. Step 2: Convert to fraction form
    837.99/1,255.36 = 405.45/x
  3. Step 3: Cross multiply
    837.99x = 1,255.36 × 405.45
  4. Step 4: Simplify right side
    837.99x = 508,985.71
  5. Step 5: Solve for x
    x = 508,985.71/837.99
  6. Step 6: Final answer
    x = 607.39

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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.