Home / 78,445.38-117,620.60-31,643.58

Finding the Fourth Proportional to 78,445.38, 117,620.60 and 31,643.58

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Solution

The fourth proportional to 78,445.38, 117,620.60 and 31,643.58 is: 47,446.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,445.38 : 117,620.60 = 31,643.58 : x
  2. Step 2: Convert to fraction form
    78,445.38/117,620.60 = 31,643.58/x
  3. Step 3: Cross multiply
    78,445.38x = 117,620.60 × 31,643.58
  4. Step 4: Simplify right side
    78,445.38x = 3,721,936,707.53
  5. Step 5: Solve for x
    x = 3,721,936,707.53/78,445.38
  6. Step 6: Final answer
    x = 47,446.22

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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.