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Finding the Fourth Proportional to 1,120.42, 1,679.55 and 572.86

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Solution

The fourth proportional to 1,120.42, 1,679.55 and 572.86 is: 858.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.42 : 1,679.55 = 572.86 : x
  2. Step 2: Convert to fraction form
    1,120.42/1,679.55 = 572.86/x
  3. Step 3: Cross multiply
    1,120.42x = 1,679.55 × 572.86
  4. Step 4: Simplify right side
    1,120.42x = 962,147.01
  5. Step 5: Solve for x
    x = 962,147.01/1,120.42
  6. Step 6: Final answer
    x = 858.74

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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.