Home / 78,640.40-117,960.60-70,111.10

Finding the Fourth Proportional to 78,640.40, 117,960.60 and 70,111.10

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Solution

The fourth proportional to 78,640.40, 117,960.60 and 70,111.10 is: 105,166.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,640.40 : 117,960.60 = 70,111.10 : x
  2. Step 2: Convert to fraction form
    78,640.40/117,960.60 = 70,111.10/x
  3. Step 3: Cross multiply
    78,640.40x = 117,960.60 × 70,111.10
  4. Step 4: Simplify right side
    78,640.40x = 8,270,347,422.66
  5. Step 5: Solve for x
    x = 8,270,347,422.66/78,640.40
  6. Step 6: Final answer
    x = 105,166.65

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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.