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Finding the Fourth Proportional to 854.40, 1,179.47 and 500.28

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Solution

The fourth proportional to 854.40, 1,179.47 and 500.28 is: 690.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.40 : 1,179.47 = 500.28 : x
  2. Step 2: Convert to fraction form
    854.40/1,179.47 = 500.28/x
  3. Step 3: Cross multiply
    854.40x = 1,179.47 × 500.28
  4. Step 4: Simplify right side
    854.40x = 590,062.08
  5. Step 5: Solve for x
    x = 590,062.08/854.40
  6. Step 6: Final answer
    x = 690.61

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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.