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Finding the Fourth Proportional to 78,298.90, 117,447.78 and 19,134.03

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Solution

The fourth proportional to 78,298.90, 117,447.78 and 19,134.03 is: 28,700.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,298.90 : 117,447.78 = 19,134.03 : x
  2. Step 2: Convert to fraction form
    78,298.90/117,447.78 = 19,134.03/x
  3. Step 3: Cross multiply
    78,298.90x = 117,447.78 × 19,134.03
  4. Step 4: Simplify right side
    78,298.90x = 2,247,249,345.95
  5. Step 5: Solve for x
    x = 2,247,249,345.95/78,298.90
  6. Step 6: Final answer
    x = 28,700.91

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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.