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Finding the Fourth Proportional to 485,321.49, 669,793.74 and 291,792.51

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Solution

The fourth proportional to 485,321.49, 669,793.74 and 291,792.51 is: 402,703.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,321.49 : 669,793.74 = 291,792.51 : x
  2. Step 2: Convert to fraction form
    485,321.49/669,793.74 = 291,792.51/x
  3. Step 3: Cross multiply
    485,321.49x = 669,793.74 × 291,792.51
  4. Step 4: Simplify right side
    485,321.49x = 195,440,796,576.89
  5. Step 5: Solve for x
    x = 195,440,796,576.89/485,321.49
  6. Step 6: Final answer
    x = 402,703.78

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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.