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Finding the Fourth Proportional to 443,575.90, 665,428.07 and 139,866.97

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Solution

The fourth proportional to 443,575.90, 665,428.07 and 139,866.97 is: 209,820.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,575.90 : 665,428.07 = 139,866.97 : x
  2. Step 2: Convert to fraction form
    443,575.90/665,428.07 = 139,866.97/x
  3. Step 3: Cross multiply
    443,575.90x = 665,428.07 × 139,866.97
  4. Step 4: Simplify right side
    443,575.90x = 93,071,407,903.85
  5. Step 5: Solve for x
    x = 93,071,407,903.85/443,575.90
  6. Step 6: Final answer
    x = 209,820.70

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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.