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Finding the Fourth Proportional to 651.68, 899.20 and 389.60

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Solution

The fourth proportional to 651.68, 899.20 and 389.60 is: 537.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.68 : 899.20 = 389.60 : x
  2. Step 2: Convert to fraction form
    651.68/899.20 = 389.60/x
  3. Step 3: Cross multiply
    651.68x = 899.20 × 389.60
  4. Step 4: Simplify right side
    651.68x = 350,328.32
  5. Step 5: Solve for x
    x = 350,328.32/651.68
  6. Step 6: Final answer
    x = 537.58

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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.