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Finding the Fourth Proportional to 854.04, 1,280.22 and 638.58

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Solution

The fourth proportional to 854.04, 1,280.22 and 638.58 is: 957.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.04 : 1,280.22 = 638.58 : x
  2. Step 2: Convert to fraction form
    854.04/1,280.22 = 638.58/x
  3. Step 3: Cross multiply
    854.04x = 1,280.22 × 638.58
  4. Step 4: Simplify right side
    854.04x = 817,522.89
  5. Step 5: Solve for x
    x = 817,522.89/854.04
  6. Step 6: Final answer
    x = 957.24

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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.