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Finding the Fourth Proportional to 443,609.36, 665,216.40 and 127,991.24

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Solution

The fourth proportional to 443,609.36, 665,216.40 and 127,991.24 is: 191,929.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,609.36 : 665,216.40 = 127,991.24 : x
  2. Step 2: Convert to fraction form
    443,609.36/665,216.40 = 127,991.24/x
  3. Step 3: Cross multiply
    443,609.36x = 665,216.40 × 127,991.24
  4. Step 4: Simplify right side
    443,609.36x = 85,141,871,904.34
  5. Step 5: Solve for x
    x = 85,141,871,904.34/443,609.36
  6. Step 6: Final answer
    x = 191,929.84

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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.