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Finding the Fourth Proportional to 289,324.20, 405,987 and 289,324.20

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Solution

The fourth proportional to 289,324.20, 405,987 and 289,324.20 is: 405,987

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,324.20 : 405,987 = 289,324.20 : x
  2. Step 2: Convert to fraction form
    289,324.20/405,987 = 289,324.20/x
  3. Step 3: Cross multiply
    289,324.20x = 405,987 × 289,324.20
  4. Step 4: Simplify right side
    289,324.20x = 117,461,863,985.40
  5. Step 5: Solve for x
    x = 117,461,863,985.40/289,324.20
  6. Step 6: Final answer
    x = 405,987

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.