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Finding the Fourth Proportional to 443,430.45, 665,309.70 and 143,920.80

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Solution

The fourth proportional to 443,430.45, 665,309.70 and 143,920.80 is: 215,934.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,430.45 : 665,309.70 = 143,920.80 : x
  2. Step 2: Convert to fraction form
    443,430.45/665,309.70 = 143,920.80/x
  3. Step 3: Cross multiply
    443,430.45x = 665,309.70 × 143,920.80
  4. Step 4: Simplify right side
    443,430.45x = 95,751,904,271.76
  5. Step 5: Solve for x
    x = 95,751,904,271.76/443,430.45
  6. Step 6: Final answer
    x = 215,934.44

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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.