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Finding the Fourth Proportional to 92,823.20, 139,081.20 and 78,999.20

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Solution

The fourth proportional to 92,823.20, 139,081.20 and 78,999.20 is: 118,368.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,823.20 : 139,081.20 = 78,999.20 : x
  2. Step 2: Convert to fraction form
    92,823.20/139,081.20 = 78,999.20/x
  3. Step 3: Cross multiply
    92,823.20x = 139,081.20 × 78,999.20
  4. Step 4: Simplify right side
    92,823.20x = 10,987,303,535.04
  5. Step 5: Solve for x
    x = 10,987,303,535.04/92,823.20
  6. Step 6: Final answer
    x = 118,368.08

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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.