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Finding the Fourth Proportional to 485,311.72, 669,780.25 and 291,782.72

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Solution

The fourth proportional to 485,311.72, 669,780.25 and 291,782.72 is: 402,690.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,311.72 : 669,780.25 = 291,782.72 : x
  2. Step 2: Convert to fraction form
    485,311.72/669,780.25 = 291,782.72/x
  3. Step 3: Cross multiply
    485,311.72x = 669,780.25 × 291,782.72
  4. Step 4: Simplify right side
    485,311.72x = 195,430,307,556.69
  5. Step 5: Solve for x
    x = 195,430,307,556.69/485,311.72
  6. Step 6: Final answer
    x = 402,690.27

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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.