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Finding the Fourth Proportional to 858.08, 1,280.90 and 754.28

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Solution

The fourth proportional to 858.08, 1,280.90 and 754.28 is: 1,125.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.08 : 1,280.90 = 754.28 : x
  2. Step 2: Convert to fraction form
    858.08/1,280.90 = 754.28/x
  3. Step 3: Cross multiply
    858.08x = 1,280.90 × 754.28
  4. Step 4: Simplify right side
    858.08x = 966,157.25
  5. Step 5: Solve for x
    x = 966,157.25/858.08
  6. Step 6: Final answer
    x = 1,125.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.