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Finding the Fourth Proportional to 113,820.30, 170,730.45 and 78,390.90

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Solution

The fourth proportional to 113,820.30, 170,730.45 and 78,390.90 is: 117,586.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,820.30 : 170,730.45 = 78,390.90 : x
  2. Step 2: Convert to fraction form
    113,820.30/170,730.45 = 78,390.90/x
  3. Step 3: Cross multiply
    113,820.30x = 170,730.45 × 78,390.90
  4. Step 4: Simplify right side
    113,820.30x = 13,383,713,632.91
  5. Step 5: Solve for x
    x = 13,383,713,632.91/113,820.30
  6. Step 6: Final answer
    x = 117,586.35

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.