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Finding the Fourth Proportional to 628,987, 868,021.50 and 360,715

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Solution

The fourth proportional to 628,987, 868,021.50 and 360,715 is: 497,797.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,987 : 868,021.50 = 360,715 : x
  2. Step 2: Convert to fraction form
    628,987/868,021.50 = 360,715/x
  3. Step 3: Cross multiply
    628,987x = 868,021.50 × 360,715
  4. Step 4: Simplify right side
    628,987x = 313,108,375,372.50
  5. Step 5: Solve for x
    x = 313,108,375,372.50/628,987
  6. Step 6: Final answer
    x = 497,797.85

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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.