Home / 78,729.36-118,141.82-31,981.02

Finding the Fourth Proportional to 78,729.36, 118,141.82 and 31,981.02

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Solution

The fourth proportional to 78,729.36, 118,141.82 and 31,981.02 is: 47,990.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,729.36 : 118,141.82 = 31,981.02 : x
  2. Step 2: Convert to fraction form
    78,729.36/118,141.82 = 31,981.02/x
  3. Step 3: Cross multiply
    78,729.36x = 118,141.82 × 31,981.02
  4. Step 4: Simplify right side
    78,729.36x = 3,778,295,908.26
  5. Step 5: Solve for x
    x = 3,778,295,908.26/78,729.36
  6. Step 6: Final answer
    x = 47,990.94

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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.