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Finding the Fourth Proportional to 909.25, 1,254.90 and 555.28

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Solution

The fourth proportional to 909.25, 1,254.90 and 555.28 is: 766.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.25 : 1,254.90 = 555.28 : x
  2. Step 2: Convert to fraction form
    909.25/1,254.90 = 555.28/x
  3. Step 3: Cross multiply
    909.25x = 1,254.90 × 555.28
  4. Step 4: Simplify right side
    909.25x = 696,820.87
  5. Step 5: Solve for x
    x = 696,820.87/909.25
  6. Step 6: Final answer
    x = 766.37

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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.