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Finding the Fourth Proportional to 320,987.64, 443,106 and 212,157.54

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Solution

The fourth proportional to 320,987.64, 443,106 and 212,157.54 is: 292,871.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,987.64 : 443,106 = 212,157.54 : x
  2. Step 2: Convert to fraction form
    320,987.64/443,106 = 212,157.54/x
  3. Step 3: Cross multiply
    320,987.64x = 443,106 × 212,157.54
  4. Step 4: Simplify right side
    320,987.64x = 94,008,278,919.24
  5. Step 5: Solve for x
    x = 94,008,278,919.24/320,987.64
  6. Step 6: Final answer
    x = 292,871.96

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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.