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Finding the Fourth Proportional to 651.53, 899.15 and 399.21

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Solution

The fourth proportional to 651.53, 899.15 and 399.21 is: 550.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.53 : 899.15 = 399.21 : x
  2. Step 2: Convert to fraction form
    651.53/899.15 = 399.21/x
  3. Step 3: Cross multiply
    651.53x = 899.15 × 399.21
  4. Step 4: Simplify right side
    651.53x = 358,947.68
  5. Step 5: Solve for x
    x = 358,947.68/651.53
  6. Step 6: Final answer
    x = 550.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.