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Finding the Fourth Proportional to 651.64, 899.28 and 389.68

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Solution

The fourth proportional to 651.64, 899.28 and 389.68 is: 537.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.64 : 899.28 = 389.68 : x
  2. Step 2: Convert to fraction form
    651.64/899.28 = 389.68/x
  3. Step 3: Cross multiply
    651.64x = 899.28 × 389.68
  4. Step 4: Simplify right side
    651.64x = 350,431.43
  5. Step 5: Solve for x
    x = 350,431.43/651.64
  6. Step 6: Final answer
    x = 537.77

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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.