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Finding the Fourth Proportional to 939,121.71, 1,295,978.77 and 509,395.65

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Solution

The fourth proportional to 939,121.71, 1,295,978.77 and 509,395.65 is: 702,961.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    939,121.71 : 1,295,978.77 = 509,395.65 : x
  2. Step 2: Convert to fraction form
    939,121.71/1,295,978.77 = 509,395.65/x
  3. Step 3: Cross multiply
    939,121.71x = 1,295,978.77 × 509,395.65
  4. Step 4: Simplify right side
    939,121.71x = 660,165,947,930.35
  5. Step 5: Solve for x
    x = 660,165,947,930.35/939,121.71
  6. Step 6: Final answer
    x = 702,961.01

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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.