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Finding the Fourth Proportional to 659,315.09, 989,378.72 and 259,887.89

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Solution

The fourth proportional to 659,315.09, 989,378.72 and 259,887.89 is: 389,991.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,315.09 : 989,378.72 = 259,887.89 : x
  2. Step 2: Convert to fraction form
    659,315.09/989,378.72 = 259,887.89/x
  3. Step 3: Cross multiply
    659,315.09x = 989,378.72 × 259,887.89
  4. Step 4: Simplify right side
    659,315.09x = 257,127,546,652.26
  5. Step 5: Solve for x
    x = 257,127,546,652.26/659,315.09
  6. Step 6: Final answer
    x = 389,991.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.