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Finding the Fourth Proportional to 859.59, 1,288.08 and 570.42

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Solution

The fourth proportional to 859.59, 1,288.08 and 570.42 is: 854.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.59 : 1,288.08 = 570.42 : x
  2. Step 2: Convert to fraction form
    859.59/1,288.08 = 570.42/x
  3. Step 3: Cross multiply
    859.59x = 1,288.08 × 570.42
  4. Step 4: Simplify right side
    859.59x = 734,746.59
  5. Step 5: Solve for x
    x = 734,746.59/859.59
  6. Step 6: Final answer
    x = 854.76

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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.