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Finding the Fourth Proportional to 443,804.29, 665,818.21 and 128,259.07

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Solution

The fourth proportional to 443,804.29, 665,818.21 and 128,259.07 is: 192,420.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,804.29 : 665,818.21 = 128,259.07 : x
  2. Step 2: Convert to fraction form
    443,804.29/665,818.21 = 128,259.07/x
  3. Step 3: Cross multiply
    443,804.29x = 665,818.21 × 128,259.07
  4. Step 4: Simplify right side
    443,804.29x = 85,397,224,403.66
  5. Step 5: Solve for x
    x = 85,397,224,403.66/443,804.29
  6. Step 6: Final answer
    x = 192,420.91

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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.