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Finding the Fourth Proportional to 628,940.79, 867,911.19 and 357,003.74

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Solution

The fourth proportional to 628,940.79, 867,911.19 and 357,003.74 is: 492,649.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,940.79 : 867,911.19 = 357,003.74 : x
  2. Step 2: Convert to fraction form
    628,940.79/867,911.19 = 357,003.74/x
  3. Step 3: Cross multiply
    628,940.79x = 867,911.19 × 357,003.74
  4. Step 4: Simplify right side
    628,940.79x = 309,847,536,478.30
  5. Step 5: Solve for x
    x = 309,847,536,478.30/628,940.79
  6. Step 6: Final answer
    x = 492,649.77

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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.