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Finding the Fourth Proportional to 860.51, 1,289.05 and 397.65

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Solution

The fourth proportional to 860.51, 1,289.05 and 397.65 is: 595.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.51 : 1,289.05 = 397.65 : x
  2. Step 2: Convert to fraction form
    860.51/1,289.05 = 397.65/x
  3. Step 3: Cross multiply
    860.51x = 1,289.05 × 397.65
  4. Step 4: Simplify right side
    860.51x = 512,584.29
  5. Step 5: Solve for x
    x = 512,584.29/860.51
  6. Step 6: Final answer
    x = 595.68

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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.