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Finding the Fourth Proportional to 659,605.70, 989,112.90 and 260,040.80

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Solution

The fourth proportional to 659,605.70, 989,112.90 and 260,040.80 is: 389,944.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,605.70 : 989,112.90 = 260,040.80 : x
  2. Step 2: Convert to fraction form
    659,605.70/989,112.90 = 260,040.80/x
  3. Step 3: Cross multiply
    659,605.70x = 989,112.90 × 260,040.80
  4. Step 4: Simplify right side
    659,605.70x = 257,209,709,806.32
  5. Step 5: Solve for x
    x = 257,209,709,806.32/659,605.70
  6. Step 6: Final answer
    x = 389,944.64

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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.