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Finding the Fourth Proportional to 854.51, 1,280.81 and 436.88

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Solution

The fourth proportional to 854.51, 1,280.81 and 436.88 is: 654.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.51 : 1,280.81 = 436.88 : x
  2. Step 2: Convert to fraction form
    854.51/1,280.81 = 436.88/x
  3. Step 3: Cross multiply
    854.51x = 1,280.81 × 436.88
  4. Step 4: Simplify right side
    854.51x = 559,554.96
  5. Step 5: Solve for x
    x = 559,554.96/854.51
  6. Step 6: Final answer
    x = 654.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.