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Finding the Fourth Proportional to 909.39, 1,254.87 and 511.05

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Solution

The fourth proportional to 909.39, 1,254.87 and 511.05 is: 705.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.39 : 1,254.87 = 511.05 : x
  2. Step 2: Convert to fraction form
    909.39/1,254.87 = 511.05/x
  3. Step 3: Cross multiply
    909.39x = 1,254.87 × 511.05
  4. Step 4: Simplify right side
    909.39x = 641,301.31
  5. Step 5: Solve for x
    x = 641,301.31/909.39
  6. Step 6: Final answer
    x = 705.20

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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.