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Finding the Fourth Proportional to 909.83, 1,255.50 and 511.47

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Solution

The fourth proportional to 909.83, 1,255.50 and 511.47 is: 705.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.83 : 1,255.50 = 511.47 : x
  2. Step 2: Convert to fraction form
    909.83/1,255.50 = 511.47/x
  3. Step 3: Cross multiply
    909.83x = 1,255.50 × 511.47
  4. Step 4: Simplify right side
    909.83x = 642,150.59
  5. Step 5: Solve for x
    x = 642,150.59/909.83
  6. Step 6: Final answer
    x = 705.79

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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.