Home / 78,143.06-117,212.95-18,979.02

Finding the Fourth Proportional to 78,143.06, 117,212.95 and 18,979.02

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Solution

The fourth proportional to 78,143.06, 117,212.95 and 18,979.02 is: 28,468.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,143.06 : 117,212.95 = 18,979.02 : x
  2. Step 2: Convert to fraction form
    78,143.06/117,212.95 = 18,979.02/x
  3. Step 3: Cross multiply
    78,143.06x = 117,212.95 × 18,979.02
  4. Step 4: Simplify right side
    78,143.06x = 2,224,586,922.31
  5. Step 5: Solve for x
    x = 2,224,586,922.31/78,143.06
  6. Step 6: Final answer
    x = 28,468.13

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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.