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Finding the Fourth Proportional to 659,605.20, 989,112.15 and 260,040.30

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Solution

The fourth proportional to 659,605.20, 989,112.15 and 260,040.30 is: 389,943.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,605.20 : 989,112.15 = 260,040.30 : x
  2. Step 2: Convert to fraction form
    659,605.20/989,112.15 = 260,040.30/x
  3. Step 3: Cross multiply
    659,605.20x = 989,112.15 × 260,040.30
  4. Step 4: Simplify right side
    659,605.20x = 257,209,020,219.65
  5. Step 5: Solve for x
    x = 257,209,020,219.65/659,605.20
  6. Step 6: Final answer
    x = 389,943.89

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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.