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Finding the Fourth Proportional to 860.91, 1,291.86 and 374.01

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Solution

The fourth proportional to 860.91, 1,291.86 and 374.01 is: 561.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.91 : 1,291.86 = 374.01 : x
  2. Step 2: Convert to fraction form
    860.91/1,291.86 = 374.01/x
  3. Step 3: Cross multiply
    860.91x = 1,291.86 × 374.01
  4. Step 4: Simplify right side
    860.91x = 483,168.56
  5. Step 5: Solve for x
    x = 483,168.56/860.91
  6. Step 6: Final answer
    x = 561.23

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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.