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Finding the Fourth Proportional to 78,480.73, 117,721.55 and 19,316

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Solution

The fourth proportional to 78,480.73, 117,721.55 and 19,316 is: 28,974.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,480.73 : 117,721.55 = 19,316 : x
  2. Step 2: Convert to fraction form
    78,480.73/117,721.55 = 19,316/x
  3. Step 3: Cross multiply
    78,480.73x = 117,721.55 × 19,316
  4. Step 4: Simplify right side
    78,480.73x = 2,273,909,459.80
  5. Step 5: Solve for x
    x = 2,273,909,459.80/78,480.73
  6. Step 6: Final answer
    x = 28,974.11

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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.