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Finding the Fourth Proportional to 137,718.61, 206,579.73 and 78,483.71

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Solution

The fourth proportional to 137,718.61, 206,579.73 and 78,483.71 is: 117,726.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,718.61 : 206,579.73 = 78,483.71 : x
  2. Step 2: Convert to fraction form
    137,718.61/206,579.73 = 78,483.71/x
  3. Step 3: Cross multiply
    137,718.61x = 206,579.73 × 78,483.71
  4. Step 4: Simplify right side
    137,718.61x = 16,213,143,621.20
  5. Step 5: Solve for x
    x = 16,213,143,621.20/137,718.61
  6. Step 6: Final answer
    x = 117,726.60

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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.