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Finding the Fourth Proportional to 854.56, 1,283.28 and 558.57

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Solution

The fourth proportional to 854.56, 1,283.28 and 558.57 is: 838.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.56 : 1,283.28 = 558.57 : x
  2. Step 2: Convert to fraction form
    854.56/1,283.28 = 558.57/x
  3. Step 3: Cross multiply
    854.56x = 1,283.28 × 558.57
  4. Step 4: Simplify right side
    854.56x = 716,801.71
  5. Step 5: Solve for x
    x = 716,801.71/854.56
  6. Step 6: Final answer
    x = 838.80

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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.