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Finding the Fourth Proportional to 491,003.34, 677,355.75 and 318,909.06

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Solution

The fourth proportional to 491,003.34, 677,355.75 and 318,909.06 is: 439,945.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,003.34 : 677,355.75 = 318,909.06 : x
  2. Step 2: Convert to fraction form
    491,003.34/677,355.75 = 318,909.06/x
  3. Step 3: Cross multiply
    491,003.34x = 677,355.75 × 318,909.06
  4. Step 4: Simplify right side
    491,003.34x = 216,014,885,518.10
  5. Step 5: Solve for x
    x = 216,014,885,518.10/491,003.34
  6. Step 6: Final answer
    x = 439,945.86

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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.