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Finding the Fourth Proportional to 854.31, 1,178.91 and 476.19

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Solution

The fourth proportional to 854.31, 1,178.91 and 476.19 is: 657.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.31 : 1,178.91 = 476.19 : x
  2. Step 2: Convert to fraction form
    854.31/1,178.91 = 476.19/x
  3. Step 3: Cross multiply
    854.31x = 1,178.91 × 476.19
  4. Step 4: Simplify right side
    854.31x = 561,379.26
  5. Step 5: Solve for x
    x = 561,379.26/854.31
  6. Step 6: Final answer
    x = 657.12

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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.