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Finding the Fourth Proportional to 860.32, 1,291.12 and 404.64

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Solution

The fourth proportional to 860.32, 1,291.12 and 404.64 is: 607.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.32 : 1,291.12 = 404.64 : x
  2. Step 2: Convert to fraction form
    860.32/1,291.12 = 404.64/x
  3. Step 3: Cross multiply
    860.32x = 1,291.12 × 404.64
  4. Step 4: Simplify right side
    860.32x = 522,438.80
  5. Step 5: Solve for x
    x = 522,438.80/860.32
  6. Step 6: Final answer
    x = 607.26

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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.