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Finding the Fourth Proportional to 855.40, 1,180.85 and 501.28

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Solution

The fourth proportional to 855.40, 1,180.85 and 501.28 is: 692.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.40 : 1,180.85 = 501.28 : x
  2. Step 2: Convert to fraction form
    855.40/1,180.85 = 501.28/x
  3. Step 3: Cross multiply
    855.40x = 1,180.85 × 501.28
  4. Step 4: Simplify right side
    855.40x = 591,936.49
  5. Step 5: Solve for x
    x = 591,936.49/855.40
  6. Step 6: Final answer
    x = 692.00

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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.